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【简答题】
假设车辆前进时制动鼓逆时针方向转动,当施加制动力时,前制动蹄张开的方向与制动鼓转动方向相同,叫_;后制动蹄张开的方向与制动鼓旋转方向相反,叫_。若车辆后退,则前制动蹄为_,后制动蹄为_。
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