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GB 17625.1-2012 (GB17625.1-2012)

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GB 17625.1-2012
Electromagnetic compatibility - Limits - Limits for harmonic current emissions (equipment input current 16 A per phase)
ICS 33.100.10
L06
National Standards of People's Republic of China
Replacing GB 17625.1-2003
Electromagnetic compatibility - Limits for harmonic current emissions
(Equipment input current ≤16A)
(IEC 61000-3-2.2009, IDT)
Issued on. 2012-12-31
2013-07-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Introduction Ⅲ
1 Scope 1
2 Normative references 1
3 Terms and definitions 2
4 Overview 5
Category 5 device 5
6 5 General requirements
7 Harmonic current limits 8
Appendix A (normative) Test and measurement circuit power supply 13
A.1 Test circuit 13
A.2 Test Power 14
Appendix B (normative) for measuring equipment 16
Annex C (normative) Type test conditions 17
C.1 General 17
Test conditions of the television receiver 17 C.2
C.3 of the audio amplifier 17 the test conditions
C.4 Test conditions VCR 18
C.5 Test conditions for lighting equipment 18
C.6 freestanding and built-in incandescent lamp dimmers test conditions 19
C.7 Test conditions for vacuum cleaners 19
C.8 washing test conditions 19
C.9 Test conditions for microwave ovens 20
C.10 Information Technology Equipment (ITE) test conditions 20
C.11 cooker test conditions 21
C.12 Test conditions for air conditioner 21
C.13 kitchenware test conditions specified in IEC 60335-2-14 21
Test conditions C.14 non-dedicated arc welding equipment 21
Foreword
All technical content in this Part of GB 17625 is mandatory.
GB 17625 "EMC limits" currently includes the following components.
GB 17625.2-2007 Electromagnetic compatibility limits of the rated current per phase ≤16A and unconditional access to public low-voltage equipment
Limit voltage generated in the power supply system, voltage fluctuations and flicker
GB /Z17625.3-2000 electromagnetic compatibility limits rated current greater than 16A for equipment in low-voltage power supply system
Limiting the voltage fluctuations and flicker
GB /Z17625.4-2000 Electromagnetic compatibility Limits high voltage power system to assess load emission limits for distorting
GB /Z17625.5-2000 Electromagnetic compatibility Limits high voltage power system to assess load fluctuation of emission limits
GB /Z17625.6-2003 electromagnetic compatibility limits rated current greater than 16A for equipment in low-voltage power supply system
Harmonic current limitation
This section GB Part of 117,625.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This Part replaces GB 17625.1-2003 "Electromagnetic Compatibility Limits for harmonic current emissions (equipment input current ≤16A)".
This section compared with GB 17625.1-2003, in addition to editorial changes, the major technical changes are as follows.
--- Removed references GB 8898 and GB 4706.24, an increase of IEC 60268-1. 1985, IEC 61000-3-12 to
And Recommendation ITU-RBT.471-1 references (see Chapter 2);
--- Remove the "definition, adding" "semi-lighting", "illumination device THD" "THD" "Measurement repeatability" "measure
Reproducibility "quantity results for" measurement variability "in the definition (see Chapter 3);
--- The permission to use a simplified method of test conditions and requirements (see Chapter 6);
--- Revised instructions harmonic current measurements power values (see 6.2.2);
--- Increased harmonic current measurement repeatability and reproducibility requirements (see 6.2.3.1 and 6.2.3.2);
--- Increased harmonic current limits on the application requirements (see 6.2.3.4);
--- Increased 7.3b) described illustrates the relative phase angle and current parameters (see 7.3 Table 2);
--- Modified C class device active no more than 25W discharge lamp harmonic current limit values (see 7.3b));
--- Added comments harmonic current measurement circuit of single-phase and three-phase equipment equipment (see Figure A.1 and A.2);
--- Increasing the requirements of the television receiver measurement conditions (see C.2.2);
--- Added other test conditions in the audio amplifier input signal and load requirements (see C.3);
--- Modify the requirements of the lamp test conditions (see C.5.2);
--- Modify the requirements for vacuum cleaners test conditions (see C.7);
--- Modify the requirements for washing machines test conditions (see C.8);
--- Revised request for information technology equipment test conditions (see C.10);
--- Deletion of the requirement of other equipment test conditions.
This section identical with the international standard IEC 61000-3-2.2009 Cor.1 (Version 3.2) "Electromagnetic compatibility (EMC) 3-2 unit
Score. Limits for harmonic current emissions (equipment input current ≤16A) ". This International Standard Technical Corrigendum content has been included in Part
Points and marked with a vertical wire (║) in terms of which they are involved in the margin.
Consistency correspondence between this part of international documents and normative references of our files are as follows.
--- GB/T 2900.74-2008 Electrotechnical terminology circuit theory [IEC 60050-131.2002, MOD]
--- GB/T 4365-2003 Electrotechnical terminology Electromagnetic compatibility [idtIEC 60050 (161).1990]
--- GB/T 2900.82-2008 Electrotechnical terminology nuclear instrumentation equipment, systems, equipment and detectors [IEC 60050 (394).
2007, IDT]
--- GB/T 17309.1-1998 television broadcast receiver measuring methods - Part 1. General considerations RF electrical performance and video
Measurement and display the measurement performance (idtIEC 60107-1.1995)
--- GB 20550-2006 glow starters for fluorescent lamps (IEC 60155.1993, IDT)
--- GB/T 12060.3-2011 Sound system equipment - Part 3. audio amplifier measurement methods (IEC 60268-3.2000,
IDT)
--- Particular requirements GB 4706.7-2004 household and similar electrical appliances - Safety vacuum cleaners and water suction cleaning appliances
(IEC 60335-2-2.2002, IDT)
--- Particular requirements GB 4706.30-2008 household and similar electrical appliances for kitchen machines (IEC 60335-2-14.
2006, IDT)
--- GB 15579.1-2004 welding equipment - Part 1. Welding power sources (IEC 60974-1.2000, IDT)
--- GB/T 18039.3-2003 electromagnetic compatibility environment utility voltage power supply system frequency conducted disturbances and signaling and
Tolerance level (IEC 61000-2-2.1990, IDT)
--- GB /Z17625.6-2003 electromagnetic compatibility limits rated current greater than 16A production equipment in low voltage power supply systems
Students harmonic current limit (IEC /T R61000-3-4.1998, IDT)
--- Test GB/T 17626.7-2008 Electromagnetic compatibility - Testing and measurement techniques - power supply systems and equipment connected harmonics, interharmonics
Quantity measuring instruments and guidelines (IEC 61000-4-7.2002, IDT)
This section makes the following editorial changes.
--- In this part of Chapter 3, 3.5 and 3.8 is deleted, and the serial number after 3.5 Chapter 3 have been adjusted;
--- In section 7.3, the increase in the content of the technical corrigendum.
Electromagnetic Compatibility This part of the National Standardization Technical Committee (SAC/TC246) and focal points.
This section drafted by. China Electric Power Research Institute, Shanghai Electric Tool Research Institute, China Electronics Technology Group Corporation Institute,
China Household Electrical Appliances Research Institute, the Ministry of Industry and Information Technology Institute of Electronics V, Suzhou Exit Inspection and Quarantine, China Electronics Standardization
Institute, Zhejiang Sunshine Lighting & Electrical Group Co., Ltd., Lenovo Group.
The main drafters of this section. Wu Hung Wan Baoquan, Li Ni, Zhang Wenliang, Wang Qin, Luo Hu whole, Lin Jingping, in Zhenguo, steel Chen, Yin Haixia,
Xiao Meng, Chen Ping, Lvfei Yan.
This section replaces the following previous editions.
--- GB 17625.1-1998;
--- GB 17625.1-2003.
Electromagnetic compatibility - Limits for harmonic current emissions
(Equipment input current ≤16A)
1 Scope
This section relates to inject public power supply system harmonic current restrictions.
This section provides limits under specified test conditions that could produce the input current harmonics.
Harmonic component in accordance with Appendix A and Appendix B were measured.
This section applies to ready access to every public input current low-voltage distribution system is not more than 16A of electrical and electronic equipment.
Non-dedicated arc welding equipment, input current of each phase is not greater than 16A, within the scope of this section.
Relevant provisions of the special arc welding equipment is given in IEC 60974-1, this part does not involve, can be based on IEC /T R61000-3-4 or
IEC 61000-3-12 mount limit given.
According to the test in this section are type tests. Test conditions for particular equipment are given in Appendix C.
For nominal voltage is less than 220V limit (phase voltage) system has not yet considered.
Note. The use of the device, apparatus, parts and equipment and other words in this section, they have the same meaning in this section.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
IEC 60050 (131) International Electrotechnical Vocabulary (IEV) Chapter 131. electric and magnetic circuits [InternationalElectrotechnical
Vocabulary (IEV) -Chapter131. Electricandmagneticcircuits]
IEC 60050 (161) International Electrotechnical Vocabulary (IEV) Chapter 161. Electromagnetic compatibility [InternationalElectrotechnicalVo-
cabulary (IEV) -Chapter161. Electromagneticcompatibility]
IEC 60050 (394) International Electrotechnical Vocabulary (IEV) Chapter 394. Nuclear instrumentation equipment, systems, equipment and detectors [Interna-
tionalElectrotechnicalVocabulary (IEV) -Chapter394. Nuclearinstrumentation-Instrumens, sys-
tems, equipmentanddetectors]
IEC 60107-1 television broadcast receiver measuring methods - Part 1. General considerations - RF and video measurements (Methodsof
measurementonreceiversfortelevisionbroadcasttransmissions-Part 1. Generalconsiderations-
Measurementsatradioandvideofrequencies)
IEC 60155 fluorescent glow starter (Glow-startersforfluorescentlamps)
IEC 60268-1. 1985 Sound system equipment - Part 1. General (Soundsystemequipment-Part 1. General)
IEC 60268-3 Sound system equipment - Part 3. Amplifiers (Soundsystemequipment-Part 3. Amplifiers)
IEC 60335-2-2 Household and similar electrical appliances - Safety - Part 2-2. vacuum cleaners and water suction cleaning appliances special
Requirements (Householdandsimilarelectricalappliances-Safety-Part 2-2. Particularrequirementsforvacu-
umcleanersandwater-suctioncleaningappliances)
IEC 60335-2-14 Household and similar electrical appliances - Safety - Part 2-14. Particular requirements for kitchen machines (Household
andsimilarelectricalappliances-Safety-Part 2-14. Particularrequirementsforkitchenmachines)
IEC 60974-1 Arc welding equipment - Part 1. Welding power sources (Arcweldingequipment-Part 1. Weldingpower
sources)
IEC 61000-2-2 Electromagnetic compatibility (EMC) - Part 2. Environment Sub - part 2. Public voltage power supply system frequency conducted show
Compatible level disturbance and signal transmission [Electromagneticcompatibility (EMC) -Part 2. Environment-Section2.
Compatibilitylevelsforlow-frequencyconducteddisturbancesandsignalinginpubliclow-voltage
powersupplysystems]
IEC /T R61000-3-4 electromagnetic compatibility (EMC) Part 3-4. Limits rated current greater than 16A at low voltage devices
Power system harmonics generated by current limit [Electromagneticcompatibility (EMC) -Part 3-4. Limits-
Limitationofemissionofharmoniccurrentsinlow-voltagepowersupplysystemsforequipmentwith
ratedcurrentgreaterthan16A]
IEC 61000-3-12 electromagnetic compatibility (EMC) - Part 3-12. Limits devices connected to the public low-voltage system (per phase input
Less current is greater than 16A 75A) generated harmonic current limits [Electromagneticcompatibility (EMC) -Part 3-
12. Limits-Limitsforharmoniccurrentsproducedbyequipmentconnectedtopubliclow-voltagesys-
temswithinputcurrent> 16Aand≤75Aperphase]
IEC 61000-4-7 Electromagnetic compatibility (EMC) - Part 4-7. Testing and measurement techniques power supply systems and equipment connected harmonics, harmonic
Measurements and instrumentation, wave guide between the [Electromagneticcompatibility (EMC) -Part 4-7. Testingand
measurementtechniques-Generalguideonharmonicsandinterharmonicsmeasurementsandinstru-
mentation, forpowersupplysystemsandequipmentconnectedthereto]
ITU-RBT.471-1 color bar signal naming and description (Nomenclatureanddescriptionofcolourbarsignals)
3 Terms and Definitions
IEC 60050 (161) to determine the following terms and definitions apply to this section.
3.1
Portable tools portabletool
One kind of a hand holding a normal short-term (a few minutes) working electrical tools.
3.2
Light lamp
One source of light is generated.
3.3
Self-ballasted lamps self-balastedlamp
One kind is equipped with lamp and the light fittings assembly starts and the light source, and stable operation necessary together, and no permanent damage will not
The unit can be disassembled.
3.4
Lighting luminaire
The optical light distribution, filtering or transformation of a set of devices (not including light) emitted from one or more lamps, which includes a support, fixed and protection
All components necessary for the lamps, when necessary, further comprising a circuit accessory and connecting them to the power supply device.
3.5
Ballast balast
Connected between the supply and one or more discharge lamps, mainly used to limit the current to the lamp, an element required value. It may pack
Including varying the supply voltage and (or) frequency, power factor correction devices, which can be individually and together with the starter to start the lamp provided
Necessary conditions.
3.6
Lighting a buck converter step-downconverterforlightingequipment
Inserted between the power supply and one or more halogen or other filament lamps, to provide a lamp rated voltage device, usually in the case of high frequency.
It may consist of one or more separate components, the device may comprise for dimming, correcting the power factor and suppressing radio interference.
3.7
Reference lamp referencelamp
It was selected as a test lamp ballasts. When connecting a reference ballast, its technical requirements related to electrical parameters of the lamp given
Target closer.
3.8
Reference ballast referencebalast
In the test lamp ballast and selection criteria as compared to the standard of special inductive ballasts. Using relatively unaffected by the current, temperature and Zhou
The magnetic field around the impact of changes, stable voltage - current ratio characterize its basic characteristics.
3.9
Input current inputcurrent
AC power distribution system is supplied directly by the current device or piece of equipment.
3.10
Circuit power factor circuitpowerfactor
The measured active input power supply voltage (rms) and the supply current (RMS) multiplied by the ratio.
3.11
Active activepower
Instantaneous power over a period of average.
[IEV131-03-18]
Note. The active input power is active in the EUT power input measurements.
3.12
Balanced three-phase equipment balancedthree-phaseequipment
Rated line current modulus differ by no more than 20% of the equipment.
3.13
Special equipment professionalequipment
The use of the general public rather than equipment sold to the commercial, professional or industry. Whose name shall be specified by the manufacturer.
3.14
Total harmonic totalharmonic
3.14.1
Total harmonic current totalharmoniccurrent; THC
2 times to 40 times the total rms harmonic current components.
Total harmonic current = Σ
n = 2
I2n
3.14.2
Total harmonic distortion totalharmonicdistortion; THD
All RMS harmonic component (Part divided into 2 times to 40 times harmonic current component Ih) and RMS fundamental current ratio.
THD = Σ
h = 2
Ih
3.15
Built-in dimmer built-indimmer
Fully installed in the luminaire housing (including user-controlled) dimmers.
3.16
Partial odd harmonic current partialoddharmoniccurrent
21 times to 39 times the total rms odd harmonic current components.
Partial odd harmonic current = Σ
n = 21,23
I2n
3.17
Lighting lightingequipment
By incandescent lamps, discharge lamps or light emitting diodes and/or regulation, and/or distribution of optical radiation as the basic function of the device.
include.
--- Lights and lamps;
--- One of the main functions of the multifunction device lighting illumination section;
--- Independent discharge lamp ballasts and incandescent independent transformers;
--- Ultraviolet (UV) or infrared (IR) radiation means;
--- Illuminated advertising sign;
--- In addition to the incandescent lamp dimmer outside.
Not included.
--- Mounted lighting with the other main purposes (such as copiers, projectors, slide projectors, etc.) within the device, or lighting or indication of scale
Means;
--- Incandescent dimmers.
3.18
Standby mode stand-bymode
Sleep mode sleep-mode
A non-operating, low-power mode (usually on the device is indicated in some way), duration uncertain.
3.19
Measurement repeatability repeatabilityofresultsofmeasurements
In the same place and the same test conditions, using the same test system for harmonic current measurement results obtained for the same test equipment
Consistency between the fruit.
[IEV394-40-38, revised adoption]
3.20
Measurement reproducibility reproducibilityofresultsofmeasurements
For each measurement, to be measured under the same conditions, using different test systems, test equipment of the same harmonic current measurement
The resulting amount of consistency between the results.
[IEV394-40-39, revised adoption]
Note. Assuming a test system and test conditions meet the standards of all regulatory requirements.
3.21
Measurement variability variabilityofresultsofmeasurements
For each measurement, no intentional differences, to be measured under the same conditions, using different test systems, test different models of the same set
Preparation of harmonic current measurement, consistency between the results obtained.
Note 1. The hypothesis test systems and test conditions meet the standards of all regulatory requirements.
Note 2. In this section, the meaning of the term can be summarized as follows.
Term Meaning
Repeatability same EUT, the same test system, the same test conditions, the test is repeated
Reproducibility same EUT, but different standardized test systems and test conditions
EUT can be different types of variability with no intentional differences, but different standardized test systems and test conditions
4 Overview
The purpose of this section is to provide the harmonic emission limits its range of equipment, leave appropriate room for launching other devices. Comply with this
Limits to ensure harmonic harassment does not exceed the level specified in IEC 61000-2-2 compatible level.
Does not meet the requirements of this special equipment, if the device contains instructions for use to obtain access licensing requirements for the electricity sector, can
It is allowed to connect to certain types of low-voltage power supply system. In IEC /T R61000-3-4 or IEC 61000-3-12 have on this side
Recommendation face.
Category 5 devices
To specify the harmonic current limit, the device classified as follows.
Class A.
--- Balanced three-phase equipment;
--- Appliances, does not include equipment included in Class D;
--- Tools, excluding portable tools;
--- Incandescent dimmers;
--- Audio device.
Not defined as B, C, Class D equipment shall be considered Class A equipment.
Note 1. The power supply system has a significant impact on equipment in the next version of this section may be reclassified. Factors to consider include.
--- Number of devices in use;
--- Duration of use;
--- The use simultaneity;
--- Power consumed;
--- Harmonic spectrum, including phase.
Class B.
--- Portable tools;
--- Arc welding equipment does not belong to special equipment.
Class C.
---lighting device.
Class D.
6.2.2 according to the requirements of the provisions of power less than 600W of the following devices.
--- Personal computers and personal computer monitors;
--- A television receiver.
Note 2. The considerations listed in Note 1, for those who have a significant impact on public power supply systems of equipment, reserved Class D limits.
6 General requirements
The following requirements apply to the provisions of Chapter 7 does not apply to devices harmonic current limits.
Requirements and limits of this chapter shall apply to ready access to 220/380V, frequency of 50Hz input device power supply system.
After a small amount of change or upgrade equipment, as long as the original full compliance test, the current of the device lower than the corresponding emission limits
60%, and supply current THD less than 15%, you can use a simplified test methods. This simplified test method comprising. Confirm updated
Device active input power changes in the original test product power ± 20% range, and supply current of less than 15% THD. full
Foot these two requirements that the products comply with the appropriate limits. However, when in doubt, give priority to complete in accordance with Chapter 6 and Chapter 7 of
Entire compliance test results.
6.1 Control Method
In accordance with IEC 60050 (161) defined in asymmetric control, as well as a half-wave rectified power supply directly carried out, only in the following cases
When using.
a) as to detect unsafe conditions only feasible method, or
B) When the equipment being controlled active input power less than 100W, or
c) controlled apparatus is the use of soft-core cable-operated portable devices, and only a short time ready to use, as only a few minutes.
If one of these three conditions are met, a half-wave rectifier can be used for any purpose, asymmetrical control can only be used to control the motor.
Note. These devices include, but are not limited to, hair dryer, kitchen appliances, portable tools.
Liable to supply low-order harmonics (n≤40) symmetrical control methods can be used to control the heating element in the input current, as long as complete
Cycle sine wave input power is not greater than 200W, or harmonic measurement results do not exceed the limits in Table 3.
Symmetrical control methods may also be used for special equipment, provided that.
a) meets one of two conditions described above, or
b) harmonic measurements of power input does not exceed the relevant limit values and the following two conditions are met.
1) should be precisely controlled temperature of the heater, the thermal time constant of less than 2s, and;
2) no other economically viable technology.
Special equipment, its main purpose is not considered as a whole heated, associated with the control limits tested.
Note 1. The main purpose is not heating products such as copiers, but the main purpose is to heat the cooker.
With symmetrical control, short-term use of household equipment (such as a hair dryer) Class A equipment shall be tested.
Even in the above case allows the use of asymmetric control and half-wave rectification, the device should still meet the harmonic requirements of this section.
Note 2. In the above case, allow the use of asymmetrical controls and half-wave rectification. However, in case of failure, the power supply current of the DC component may interfere with certain
These protection devices. Again, using the symmetric control may also occur this phenomenon.
6.2 Harmonic current measurement
6.2.1 Test Configuration
Appendix C sets out specific conditions for certain types of test equipment harmonic current measurements.
For equipment not listed in Appendix C, the emission test shall be in operation under user control or automatically programmed under normal operating conditions,
It is expected to produce the greatest of THC mode. This is a requirement of the emission test equipment configuration, rather than the value required to measure THC or looking for
Launch the worst state.
Clause 7 of the harmonic current limits apply only to the current line rather than the neutral current. For single-phase devices, allowing electrical measuring zero line
Instead of the line current flow.
According to information provided by the manufacturer of the test the EUT. In order to ensure that the results meet the condition of normal use, the start of the test
Before, you may need to start by the manufacturer of the motor pre-run.
6.2.2 measuring step
6.2.3 shall be tested in accordance with the general requirements. 6.2.4 given test cycle.
The following requirements shall measure the harmonic current.
--- For each harmonic, in accordance with the provisions of Appendix B measurement 1.5s smooth in each DFT (Discrete Fourier Transform) time window has
Valid values harmonic currents;
--- Throughout the observation period specified in 6.2.4, calculate the measured values obtained by the DFT time window arithmetic mean.
The following requirements shall be determined for calculating the input power limit value.
--- Smooth measurement 1.5s in each DFT time window active input power;
--- Over the test period, determined by the DFT time window of maximum power measurements.
Note. The active input power supply smoothing part of the measuring instrument specified in Appendix B, is the active input power in each DFT time window.
Harmonic current and active input power should be measured under the same experimental conditions, but need not be measured simultaneously.
In order to avoid drastic changes in the vicinity of a power limit value, and limits on the use of what kind of wondering, the manufacturer may provide actual measurements obtained
Deviation ± power to any value within the range of 10%, as determined by its original manufacturer's conformity assessment test limits. Experiment Report
The report shall be recorded in accordance with the value of power measurements and provisions defined in this chapter.
If you press the provisions of this chapter the measured emission test (rather than the original manufacturer conformity assessment measured test) power value and manufacturers test
Report (see 6.2.3.5) specified power value compared to not less than 90%, or no more than 110%, should be used to determine the limits specified value. when
Measurements at predetermined allowable range, the measured power shall be used to determine the value of the limit value.
For Class C equipment, use specified by the manufacturer of the fundamental current and power factor (see 3.10) to calculate limits. When calculating limits and D class
Power measurements and regulations as fundamental current and power factor measurement and components specified by the manufacturer. Fundamental current component value and should be the same
DFT measurement window used to obtain the power factor value.
6.2.3 General requirements
6.2.3.1 Repeatability
When the following conditions are met during the entire test observation period, the average value of a single harmonic current repeatability should be better than the applicable limits
± 5%.
--- The same equipment under test (EUT) (not the same type of another, even though similar);
--- Consistent test conditions;
--- The same test system;
--- Consistent environmental conditions (if relevant).
NOTE. The repeatability is required is to define the necessary observation period 6.2.4, not conformity assessment criterion used to assess whether the requirements of this section are met.
6.2.3.2 reproducibility
On the same test system using different EUT measurement, reproducibility (see 3.20) can not be calculated explicitly, so that all may apply to
The EUT, a combination of harmonic analyzer and test the power supply. But its estimated value should be better than ± (1% 10mA), where 1% refers to the entire test
1% of the total input current average value of experience within the observation period, the difference is usually smaller than the current value is negligible, but in some cases will be out
Now greater.
To avoid doubt appear this case, the test results in different locations or different occasions obtained m......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.