对于亚音速气流，若流管面积减小，则流速（）。

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.

Traffic information should include （ ） .

The phrase “Cleared via flight planned route” should not be used when granting a （ ） .

19KM is equal to （ ） .

20NM is equal to （ ） .

The altimeter setting used in en-route flight should be （ ） hpa.

The vertical separation minimum should be 300m at the altitude of or below （ ） .

Larger separations than the specified minima should be applied whenever in （ ） .