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【单选题】
数控铣床是工作台运动形式,编写,采用( )的原则编写程序。A.
刀具固定不动,工件移动
B.
工件固定不动,刀具移动
C.
分析机床运动关系后再定
D.
由机床说明书说明
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皮皮学刷刷变学霸
举一反三
【单选题】Under no circumstances _______ the difficulties when they were on an expedition to the Antarctic．
A.
they gave way to
B.
did they give way to
C.
they had given way to
D.
had they given way to
【简答题】单位和个人开具发票的时间是（ ）。
【单选题】It was announced that only when the fire was under control _______ permitted to return to their homes.
A.
would villagers be
B.
villagers would be
C.
should villagers be
D.
villagers should be
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