如图光�的四分之一圆弧轨道a、b固定在竖直平面内a端与水平面相切穿在轨道上的小球在拉力f的作用下缓慢地由a�b运动f始终沿轨道的切线 Template




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tomski如图光�的四分之一圆弧轨道a、b固定在竖直平面内a端与水平面相切穿在轨道上的小球在拉力f的作用下缓慢地由a�b运动f始终沿轨道的切线 coloring