题目内容

Susan,you’resolazy.Thisjob_________hoursago.

A. shouldhavefinished
B. couldhavefinished
C. oughttohavebeenfinished
D. musthavefinished

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Whenwereachedthepier(码头),theferryhadnotarrivedyet;sowe__________.

A. needednottohurry
B. needn’thavehurried
C. didn’tneedtohurry
D. hadnotneededinhurry

— “Did you enjoy the concert yesterday?”— “No, it was a confusion, and the band didn’t play as it __________ .”

A. did
B. used to
C. has done
D. have done

刀具磨损的初期阶段，磨损速度很快的原因是：

A. 切削温度较高
B. 切削力较大
C. 切削速度较高
D. 刀具工件接触压强较大

在剧烈磨损阶段，刀具快速产生大量磨损的原因有：

A. 刀具与工件之间的摩擦加剧
B. 切削速度加快
C. 切削温度上升
D. 切削力增大