| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| GB/T 23561.4-2009 | English | 189 |
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Methods for determining the physical and mechanical properties of coal and rock -- Part 4: Methods for calculating the porosity of coal and rock
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GB/T 23561.4-2009
| Valid |
GB/T 23561.4-2009
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