霍尔锚的的抓力系数和链的抓力系数一般分别取为()

A.2~3,0.55~1.5 B.2~3,0.75~1.5 C.3~5,0.75~1.5 D.3~5,0.55~1

时间:2023-10-15 17:09:08

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