低空
OPI新题参考(1)
01=================================1. What does ATS consist of?ATS由哪些组成?第一步,直面问题核心:It is widely known to us that ATS is short for air traffic service. ATS consists of three parts. They are air traffic...
01=================================1. What does ATS consist of?ATS由哪些组成?第一步,直面问题核心:It is widely known to us that ATS is short for air traffic service. ATS consists of three parts. They are air traffic...