4.如图所示小球从高处下落到竖直放置的轻弹簧上在弹簧压缩到最短的整个过程中下列关于能量的叙述中正确的是 A.重力势能和动能之和总保持不变 Template




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tomski4.如图所示小球从高处下落到竖直放置的轻弹簧上在弹簧压缩到最短的整个过程中下列关于能量的叙述中正确的是 a.重力势能和动能之和总保持不变 coloring