如图所示拉动木块在粗糙程度不变的水平桌面上做加速运动.以下说法中正确的是a木块受到的�擦力逐渐增大b木块受到的�擦力逐渐减小c木块受到 Template




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tomski如图所示拉动木块在粗糙程度不变的水平桌面上做加速运动.以下说法中正确的是a木块受到的�擦力逐渐增大b木块受到的�擦力逐渐减小c木块受到 coloring