如图所示水平地面放着一个光�的凹槽槽两端固定有两轻质弹簧一弹性小球在两弹簧间往复运动把槽小球和弹簧视为一个系统则在运动过程中 Template




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tomski如图所示水平地面放着一个光�的凹槽槽两端固定有两轻质弹簧一弹性小球在两弹簧间往复运动把槽小球和弹簧视为一个系统则在运动过程中 coloring