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【单选题】
移动机构的反向空行程量应尽量小,直接传动的丝杠,不得超过回转圆周的 ( )转。
A.
1/40
B.
1/30
C.
1/20
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【简答题】One is to work in a state-owned business and the other in a joint venture.You are to make a choice between the two.Write an essay to explain the reasons for your choice.You should write at least 120 w...
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