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【单选题】
表面粗糙度反映的是零件被加工表面上的（）
A.
微观的几何形状误差
B.
表面波纹度
C.
宏观的几何形状误差
D.
形状误差
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【单选题】垫圈的作用是：
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【单选题】The man didn’t admit _________ anything at the store, when he was questioned by the police.
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【单选题】The man didn’t want people know his age, ____ he did not want to have any gray hair.
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however
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【单选题】The man didn’t want people to know his age, ____ he did not want to have any gray hair.
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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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however
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