| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| GB/T 23681-2009 | English | 634 |
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Days<=4
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Refrigerating systems and heat pumps -- System flow diagrams and piping instrument diagrams -- Layout and symbols
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GB/T 23681-2009
| Valid |
GB/T 23681-2009
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