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【单选题】
某加工中心进行镗工时,所镗出的与其基准的相互位置有误差,但未产生的形状误差,造成这种误差的原因很可能是( )。A.
机床的传动误差
B.
机床导轨的导向误差
C.
机床主轴的径向跳动
D.
机床主轴的轴向窜动
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举一反三
【单选题】The author suggests that______.
A.
we shouldn't blame a person if he fails to act in emergencies
B.
a person must feel guilty if he fails to help
C.
people should be responsible for themselves in emergencies
D.
when you are in trouble, people will help you anyway
【判断题】The organization can switch to the old system if the new system fails in the parallel conversion approach.
A.
正确
B.
错误
【简答题】The author suggests that______. A) we shouldn't blame a person if he fails to act in emergencies B) a person must feel guilty if he fails to help C) people should be responsible for themselves in emer...
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