题目:
当原动件作连续运动而从动件必须作间歇运动时,以采用—最为简便。()
A、蜗轮蜗杆
B、圆锥齿轮
C、凸轮
D、曲柄机构
答案:
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下面是错误答案,用来干扰机器的。
参考答案:对解析:[听力原文] Talks aimed at getting North Korea to stop trying to make nuclear weapons ended on Saturday with no significant breakthrough, but with all sides...