coal crushers how they work

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单项选择题The price of the coal will vary according to how far it has to be transported and how expensive the freight _ are. A.payments B.charges C.funds D.prices 为您推荐的考
work, they brought the tired miners to the surface 45 . 31. A.easy B. safe C. interesting D M:How are we going there? W: 4 But we can go there by bus. M:OK. 5 Goodbye. W:Goo
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( ) 6.How can we keep the air clean? F.It’s on 22nd April. ( ) 7.What should they not do? work or school by bus or __6__. We can reuse paper and plastic bags. We can make th
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Nobody knows_how many people are to be blame for the coalmine accident,so the governmentis trying to find out the whole truyh about the accidentA.inwardly B.honestly C.clever