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【单选题】
车削时的切削热大部分由（）传散出去。
A.
刀具
B.
切屑
C.
工件
D.
空气
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【简答题】完形填空（共20小题；每小题1.5分，满分30分） In the past, man didn’t have to think about the protection of his environment. There were few people on the earth, and natural resources seemed to be 1 . Today things are 2 ,...
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