closedopenn.关开closedadj.关闭的；封闭的；停业的动词close的过去式和过去分词.closed binder course紧密结合层closed the door uponv.堵死 ... 的门路(拒 ... 于门外)closed drainage area闭流区closed-feed system闭式给水系统,闭式馈给系统closed wound suction闭合式创口吸引Closed at one end.一端不通的。closed-coil reflux封闭盘管回流closed - open loop开闭环控制closed cipher system封闭的密码体制Closed-mold device合模装置