题目内容

热处理是改善钠切削加工性能的重要途径。

A. 正确
B. 错误

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The ship（）on a low rock was broken in two by the waves.

A. that had been driven
B. had been driven
C. have been driven
D. which to have been drive

通常所称的焊条直径均是指（）。

切削加工中,提高切削速度就不易断屑.

A. 正确
B. 错误

椭圆－圆孔型系统的优点是轧件运行稳定。

A. 正确
B. 错误