如图所示杆bc的b端用铰链接于竖直墙上另一端c为一定�轮.重物g系一绳经过�轮固定于墙上的a点杆恰好平衡.若将绳的a端沿墙�上移再使之 Template




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tomski如图所示杆bc的b端用铰链接于竖直墙上另一端c为一定�轮.重物g系一绳经过�轮固定于墙上的a点杆恰好平衡.若将绳的a端沿墙�上移再使之 coloring