如图所示木块a放在木块b的左上端两木块间的动�擦因数为μ用水平恒力f将木块a拉至b的右端第一次将b固定在地面上f做的功为w1系统 Template




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tomski如图所示木块a放在木块b的左上端两木块间的动�擦因数为μ用水平恒力f将木块a拉至b的右端第一次将b固定在地面上f做的功为w1系统 coloring