发布时间:2025-01-19 08:10:05
螺旋升角r,导程h,公称直径d,有公式的!!
tan r =h/3.14d
推力=负载/tan r
我不小心把狗踩到了那女的很严肃的说踩到了也不跟狗道歉下她是开玩笑呢还是侮辱我
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