从课本中�们已经知道两个相互接触的物体当它们�生相对运动时就会在接触面上产生一种阻碍相对运动的力这种力叫做�动�擦力.从实验知道�动 Template




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tomski从课本中�们已经知道两个相互接触的物体当它们�生相对运动时就会在接触面上产生一种阻碍相对运动的力这种力叫做�动�擦力.从实验知道�动 coloring