题目内容

All cars ______ nowadays are equipped with safety belts.

A. to be produced
B. making
C. producing
D. produced

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--I usually go to Shanghai by train. --Why not ______ there by boat for a change.9

A. to try to go
B. try going
C. to try going
D. try to go

切屑的种类有（）

A. 带状切屑
B. 节状切屑
C. 粒状切屑
D. 崩碎切屑

切削加工塑性材料时，最易产生积屑瘤的条件是（）

A. Vc ≤10m/min
B. Vc = 30m/min
C. Vc = 50m/min
D. Vc ≥60m/min

加工细长轴时，刀具主偏角Kr应选择_____ 最为合理。

A. 30°
B. 45°
C. 60°
D. 90°