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【单选题】
机械加工工艺系统在切削力、夹紧力、重力和惯性力等作用下会产生变形,从而破坏了已调整好的工艺系统各组成部分的( )关系,导致加工误差的产生。A.
相互位置
B.
相互运动
C.
相互夹紧
D.
相互安装
手机使用
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新浪微博
分享QQ
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反馈参考答案：
举一反三
【单选题】—Can you tell me where he is? —Sorry, _____. [ ]
A.
I can
B.
I don't know
C.
I know
D.
I don't
【简答题】环氧丙烷经开环聚合后，可得到不同立构的聚合物(无规、全同、间同)，试写出它们的不同立构体，并大致预计它们对聚合物性能会带来怎样的影响。
【单选题】I really don’t know ___ ___I kept the secret papers.
A.
where was it
B.
it was where that
C.
where it was that
D.
where was it that
【单选题】-Where are the English books? -Sorry, ___. [ ]
A.
I know
B.
I don’t know
C.
it isn’t
D.
they’re not
【简答题】-Where are the English books? ---Sorry, ___. A I know B I don’t know C it isn’t D they’re not
【单选题】I really don’t know ________ I put my wallet after I paid the bill.
A.
where was it
B.
it was where that
C.
where it was that
D.
where was it that
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