相关题目
In RTF communication, the A/C call sign 9099Y is spoken as （ ）.
Prior to starting transmission, a pilot or controller should （ ）.
When flying in the mountainous area, and there is strong wind or strong updraught/downdraught, the aircraft should maintain at least （ ） meters minimum safety altitude from the obstacles.
Helicopters can operate at a height between 1 and 10 meters with 10 meters distance from obstacles, but its flying speed should not exceed （ ） km/h.
The flight time refers to （ ） .
Landing time refers to （ ） .
Takeoff time refers to （ ） .
Aircraft without oxygen equipment or whose oxygen equipment is unserviceable are not supposed to fly above （ ） m.
The in-flight personnel on board an unpressurized aircraft should start to use oxygen at the altitude of （ ） m.
The aircraft shall be informed when it is approaching the point of interception of the glide path and, just before intercepting the glide path, it shall be instructed to begin its descent and （ ） .
