题目内容
_____ aircraft movement both in the air and on the ground is of great importance.
查看答案
搜索结果不匹配？点我反馈
更多问题
Aerial _____ is the process of transferring aviation fuel from one military aircraft (the tanker) to another (the receiver) during flight.
Maintenance and refueling _____ for aircraft are located near the runways.
A _____ is a closed building structure to hold aircraft, spacecraft or military tanks in protective storage.
An airport needs to provide large automobile parking areas or multistory ramps to _____ travelers.
微信支付 
支付宝支付