下列物体中机械能一定守恒的是 A.受到平衡力作用而运动的物体b.只受重力作用而运动的物体c.只受重力和拉力作用而运动的物体d.在水平面上 Template




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tomski下列物体中机械能一定守恒的是 a.受到平衡力作用而运动的物体b.只受重力作用而运动的物体c.只受重力和拉力作用而运动的物体d.在水平面上 coloring