China Coal tar pitch GB Standards Search Result |
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GB/T 2291-2016 Method for preparation of Coal tar pitch specimens 煤沥青实验室试样的制备方法 - 英文版 |
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GB/T 2290-2012 Coal tar pitch 煤沥青 - 英文版 |
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GB/T 2291-1980 Method for preparation of Coal tar pitchs specimens 煤沥青试验室试样的制备方法 - 英文版 |
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