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蜗杆和蜗轮传动时（）

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蜗杆和蜗轮传动时（）

A.他们的螺旋方向一定相同

B.他们的螺旋方向一定不同

C.蜗杆的螺旋角小于蜗轮的螺旋角

D.上述选项均不对

参考答案:

答案：他们的螺旋方向一定相同

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