2.置于水平面上的物体在水平方�的拉力作用下�前运动当拉力增大时物体的运动速度也随之变大则该物体所受的�动�擦力将 A.增大 B.不变 Template




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tomski2.置于水平面上的物体在水平方�的拉力作用下�前运动当拉力增大时物体的运动速度也随之变大则该物体所受的�动�擦力将 a.增大 b.不变 coloring