题目内容 (请给出正确答案)
提问人:网友f******g 发布时间:2022年5月4日 15:52
[ 单项选择题]

摩擦提升要增大摩擦力,必须增大围包角,轻侧加配重和()。

A.增大摩擦系数

B.加粗钢丝绳

C.变细钢丝绳

D.减小摩擦系数

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