如图7所示小球内静止轨道最高处a点滚下到最低点b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7所示小球内静止轨道最高处a点滚下到最低点b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