相关题目
According to ICAO definition, a condition concerning the safety of an aircraft or other vehicle or of some person on board or within sight but which does not require immediate assistance is （ ） .
There are （ ） VHF channels provided for the aviation voice communications.
Which SSR Code is not right?
The highest VHF frequency of radio communication between air and ground is （ ） .
The lowest VHF frequency of radio communication between air and ground is （ ） .
（ ） is the accepted standard for worldwide time signal broadcast used for aviation.
（ ） means the level is measured in 1013.2 pha.
An aircraft known or believed to be in a state of emergency should be given（ ） over other aircraft.
The Secondary Radar can provide （ ） information.
SSR code is a （ ） digital number.
