用五个相同质量的滑轮和绳子组成如图所示的甲、乙两个滑轮组，在绳子自由端分别用力将重力为G的物体匀速提拉，乙滑轮组的效率为η乙，不计摩擦、绳和木板的重，下列说法正确的是( )
正确答案及解析
正确答案
B、C、D
解析
暂无解析
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