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【单选题】
通过热加工,会使金属材料的致密度( )A.
增加
B.
降低
C.
基本不变
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【简答题】This is Liu Fei’s room. It’s a small but nice room. On the wall, there are two maps. One is a map of China, the other is of the world. There’s a desk in front of the window and on the desk there is a ...
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A.
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B.
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C.
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