如图所示两个小球a和b中间用弹簧连接并用细绳悬于天花板下下面四对力中属于平衡力的一对力是 A.绳对a的拉力和弹簧对a的拉力b Template




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tomski如图所示两个小球a和b中间用弹簧连接并用细绳悬于天花板下下面四对力中属于平衡力的一对力是 a.绳对a的拉力和弹簧对a的拉力b coloring