如图所示小球由静止开始沿光�的斜面下�经过bc两位置时具有相同的 A.速度b.动能c.重力势能d.机械能 题目和参考答案——青夏教育 Template




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tomski如图所示小球由静止开始沿光�的斜面下�经过bc两位置时具有相同的 a.速度b.动能c.重力势能d.机械能 题目和参考答案——青夏教育 coloring