发球界线
【化】 动力管线

trunk line service branch line service combined line and recording service service line line upon line accountancy service medical service service bits service policy service trade line service line out of service private line teletypewriter service service request line on-line service on-line bibliographic service private line service service guide-line hot line service on-line information retrieval service Creighton on-line multiple medical education service(COMMES)