下列关于�擦力的说法正确的是a�擦力的大小一定跟两物体间的正压力大小成正比b�擦力的方�一定和物体的运动方�相反c静�擦力只可能对物体做 Template




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tomski下列关于�擦力的说法正确的是a�擦力的大小一定跟两物体间的正压力大小成正比b�擦力的方�一定和物体的运动方�相反c静�擦力只可能对物体做 coloring