题目内容

___ today, he would get there by Friday.

A. Would he have left
B. Was he leaving
C. Were he to leave
D. If he leaves

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I usually watch TV in the evening ___ I have to study for an examination.

A. because
B. unless
C. while
D. the moment

安全裕度A应按被检验工件的公差大小来确定，一般为工件公差的。

A. 1/2
B. 1/3
C. 1/10
D. 1/5

验收极限是检验工件尺寸时判断的尺寸极限。

确定工件尺寸的验收极限的方案有：方案和方案。