| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| HG/T 21621-1991 | English | 2819 |
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Days<=13
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(Chemical companies and the cable trench laying cables buried common chart)
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HG/T 21621-1991
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HG/T 21621-1991
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