如图所示物块ab叠放在水平面上用f=1n水平力分别作用于物块ab上ab保持静止则b对a的�擦力为 A.0b.1n 水平�左c Template




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tomski如图所示物块ab叠放在水平面上用f=1n水平力分别作用于物块ab上ab保持静止则b对a的�擦力为 a.0b.1n 水平�左c coloring