国际民航组织规定108.25MHz用于（）。

The simplest barometer is the （ ） barometer.

“Starboard engine” means （ ） .

“Port engine” means （ ） .

In the flight data recorders the voice recorder tape is “wiped” continuously, so that at any moment the （ ） half hour’s data is stored.

Large airports will have round-the-clock standby emergency services, which means （ ） .

For the type of an aircraft, “combi” means the interchangeable （ ） aircraft.

A runway or a taxiway that is closed to all operations is marked with a large （ ） at each end.

The runway-in-use is normally determined by （ ） .

The runway number is determined by the （ ） of the runway.

Viewed from the aircraft, the top of the cloud looks bright, this means that the cloud layer （ ）.