使用滑轮组时，拉起重物所用力大小决定于：A、定滑轮的个数; �

使用滑轮组时，拉起重物所用力大小决定于：

A、定滑轮的个数; B、动滑轮的个数;

C、定滑轮和动滑轮的个数; D、连接动滑轮绳子的股数.

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使用滑轮组时，拉起重物所用力大小决定于：A、定滑轮的个数; �

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