发布时间:2025-02-03 18:49:45
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
我是安阳滑县的,农村户口, 在郑州工作,现在想辞职。辞职以后能拿到住房公积金么
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