如图所示平直木板ab倾斜放置板上的p点距a端较�小物块与木板间的动�擦因数由a到b逐渐减小先让物块从a由静止开始�到b然后将a着地 Template




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tomski如图所示平直木板ab倾斜放置板上的p点距a端较�小物块与木板间的动�擦因数由a到b逐渐减小先让物块从a由静止开始�到b然后将a着地 coloring