To this day coal is said to be screened in the colliery when it has stone and other impurities removed from it.
据说煤中掺有石子和其它杂质须去掉时，至今仍得把煤在矿上筛过。
Using coal gangue of Qitaihe as raw material, the best surface medication agent was screened through the test of medication choosing and rubber filling.
以七台河矿区煤矸石为原料，通过改性药剂选择试验和橡胶填充试验筛选最佳表面改性剂。
应用推荐