如图8 12所示甲乙两物体叠放在光�的水平面上如分别用10n的拉力f甲f乙沿水平方�拉木块则甲物体受到的�擦力大小为 n方�是 Template




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tomski如图8 12所示甲乙两物体叠放在光�的水平面上如分别用10n的拉力f甲f乙沿水平方�拉木块则甲物体受到的�擦力大小为 n方�是 coloring