短语词组短语wear limit dimension 磨损极限尺寸motor brush wear limit 电机电刷磨损限度service wear limit 维修磨损极限exceed wear limit 磨耗超限valve guide wear limit 气门导管磨损极限specified wear limit 规定的磨损极限limit wear 极限磨损量limit wear angle 极限磨损角 返回 wear limit