如图所示轻弹簧的一端与物块p相连另一端固定在木板上.先将木板水平放置并使弹簧处于拉伸状态.缓慢抬起木板的右端使倾角逐渐增大直至物块p Template




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tomski如图所示轻弹簧的一端与物块p相连另一端固定在木板上.先将木板水平放置并使弹簧处于拉伸状态.缓慢抬起木板的右端使倾角逐渐增大直至物块p coloring