物体所受重力是100n当如图对它施加一个水平�左的30n的压力将它压在竖直墙面上处于静止此时它受到的�擦力是 N方� 当将它放在水平 Template




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tomski物体所受重力是100n当如图对它施加一个水平�左的30n的压力将它压在竖直墙面上处于静止此时它受到的�擦力是 n方� 当将它放在水平 coloring