在水平面上一轻质弹簧竖直放置在它正上方一物体自由落下如图所示在物体压缩弹簧速度减为零的过程中 A.物体的动能不断减小b.物体所受的 Template




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tomski在水平面上一轻质弹簧竖直放置在它正上方一物体自由落下如图所示在物体压缩弹簧速度减为零的过程中 a.物体的动能不断减小b.物体所受的 coloring