信函业务,是邮政的一项基本业务和支柱业务,信件传递的快慢,充分反映出了邮政工作的好坏。为了解决市内信件传递速度慢的问题,洛阳市邮政局运用系统的观点和方法,制定出了市内互寄信件的四单作业法。即:各邮政生产处理环节对市内信件要坚决做到“四单”—— Mail business, postal is a basic business and pillar business, the speed of mail delivery, fully reflects the postal work is good or bad. In order to solve the problem of slow delivery of letters in the city, Luoyang Post Office made use of systematic opinions and methods to formulate four single-homework laws in the city for mailing letters. That is: all the postal production and processing aspects of the letter to the city to be resolutely “four single ” -