发布时间:2025-01-31 04:21:34
环氧磨石骨料配方:
1、A组分:环氧树脂、颜填料、助剂。
2、B组分:MDI芳香族聚异氰酸酯、骨料、80-120目砂。
3、C组分:20-40目砂、80-120目砂、骨料、80-120目砂。
2020年劳动节法定假日是几天2020年五一为什么放五天五一劳动节的来历是什么
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