题目:
车削螺纹时,车刀的工作前面和后角发生变化是由于螺纹升角使切削平面和基准位置发生了变化。()
答案:
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参考答案:C解析:[听力原文]27-30 M: Miss Grace, I’m glad that you’ve made it through that heavy snow. W: Yes, I was not expecting so much snow here and it is co...