B如图所示轻杆bc一端用铰链固定于墙上另一端有一小�轮c系重物的轻绳绕过�轮c将上端固定于墙上的a点不计�擦系统处于静止状态现将a Template




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tomskib如图所示轻杆bc一端用铰链固定于墙上另一端有一小�轮c系重物的轻绳绕过�轮c将上端固定于墙上的a点不计�擦系统处于静止状态现将a coloring