物体a放在粗糙的斜面上受一平行斜面�上的拉力f作用物体保持静止如图所示则物体a所受的�擦力 A一定沿斜面�上b一定沿斜面� Template




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tomski物体a放在粗糙的斜面上受一平行斜面�上的拉力f作用物体保持静止如图所示则物体a所受的�擦力 a一定沿斜面�上b一定沿斜面� coloring