如图所示小球由静止从轨道最高处的a点滚下到最低处的b点时下列说法中正确的是 A.小球在a点时只有动能没有重力势能b.小球在a点时只有 Template




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tomski如图所示小球由静止从轨道最高处的a点滚下到最低处的b点时下列说法中正确的是 a.小球在a点时只有动能没有重力势能b.小球在a点时只有 coloring