4 . practical meteorology : isopleths analysis ; streamline analysis ; use of tephigram ; interpretation of weather charts ; weather observations ; codes in common use ; principles and exposure requirements of weather instruments ; telecommunications procedures 4 .实用气象学：等值线分析流线分析温熵图应用天气图解释天气观测通用电码气象仪器原理及安装条件电信程序。
