Black polypropylene impact co-polymer enclosure.
黑色聚丙烯共聚物箱体。
The properties of cement mortar modified by hydroxyethyl methyl cellulose and vinyl co-polymer were studied.
研究了羟乙基甲基纤维素和乙烯基共聚物两种聚合物干粉改性砂浆加水搅拌后的性能。
Catalytic active site by the group and the combined group, who co-polymer with a three-dimensional structure.
活性中心由催化基团和结合基团，他们与高分子共同构成一个立体结构。
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