perchn.栖木；高位；杆；河鲈鱼v.栖息；就位；位于perchloricationn.全氯化perchloromethyl高氯甲基perchloroethane六氯乙烷perchlormethane[医] 四氯化碳perched aquifer表层含水层perched-water表层流perchlorinationn.全氯化perchloride test过氯化物试验perchloride iron氯化高铁perchloromethanen.四氯化碳