GB/T 12009.4-1989
Polymethylene polyphenyl isocyanate--Determination of isocyanate content 多亚甲基多苯基异氰酸酯中异氰酸根含量测定方法 |
GB/T 11909-1989
Water quality--Determination of silver--Spectrophotometric method with 3,5-Br2-PADAP 水质 银的测定 3,5-Br2-PADAP分光光度法 |
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