如图所示ab两个物块的重量分别为nn弹簧的重量不计系统沿竖直方�处于静止状态这时弹簧的弹力n则天花板受到的拉力和地板受到的压力 Template




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tomski如图所示ab两个物块的重量分别为nn弹簧的重量不计系统沿竖直方�处于静止状态这时弹簧的弹力n则天花板受到的拉力和地板受到的压力 coloring