卫星通信是以卫星作为（）的微波通信系统。

We have undercarriage trouble, we＇d like to （ ） .

Takeoff aborted, engine NO.2 was low on （ ） .

We＇ve just been struck by （ ） and we＇ll have to go back the apron to check our electrics.

There are already 3 aircraft （ ） at the holding point of 12.

There＇s no taxiway available, so you＇ll have to turn at the end of the runway and （ ） .

Which word has nothing to do with the problems caused by snow on an airport?

Before an aircraft can taxi out, the chocks will have to be （ ）.

Which word does not go with all the others?

The words “crowded”, “squeeze”, “congestion” all refer to （ ）.

“Clipper 221, takeoff aborted due to engine trouble.” implies a （ ）.