22.如上图所示物体与一轻质弹簧相连置于水平面上将物体拉至a点释放物体恰好静止不动物体所受�擦力为f今用一力将物体再拉x至b点时 Template




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tomski22.如上图所示物体与一轻质弹簧相连置于水平面上将物体拉至a点释放物体恰好静止不动物体所受�擦力为f今用一力将物体再拉x至b点时 coloring