perchn.栖木;高位;杆;河鲈鱼v.栖息;就位;位于
perchloropropane八氯丙烷
perchlor-ether全氯乙醚
perchlorethylenen.[化]全氯乙烯
perchlorobenzenen.六氯苯
perchlorate salt高氯酸盐
perching machine铲软机
perchloride tests[医] 过氯化物试验(检孕)
perchloroparaffinn.全氯化石蜡
perchloroethylenen.全氯乙烯
perch on the tree在树上栖息