下滑信标工作在（）波段。

The pilot-in-command shall （ ） a flight plan to the relevant ATC unit at least one hour before the estimated time of departure.

Among “Distress”, “Urgency “and “Danger”, which one needs immediate assistance?

In weather report, “CB” means .

The primary principle to follow when dealing with hijacking event is （ ）.

The hijacker wants a car waiting on the runway, he will keep two passengers as （ ） .

“Glide slope” of an ILS can provide the aircraft a （ ） indication.

The localizer of an ILS can provide the （ ） of an aircraft to the runway.

When an aircraft cannot put gears down, it will need （ ） .

“Belly landing “means （ ） .

“Engine partially disintegrated” means the engine （ ） .