转弯速度250kt，转弯坡度20°，则转弯半径为（）km。

Number two engine is overheating due to bird （ ）on initial climb out, request priority landing at your airport.

Go around, （ ） , unreported vehicle is crossing runway.

Which of the following belong to the international (regional) airway?

The level scope for A and B class airspace is （ ）.

Of the four classes of airspace, （ ） are area control airspace.

DAL345, 20 miles north of Nington, IFR, FL120, （ ） zone boundary 20, KNT24, information M.

GAB, over KON 3000ft, runway in sight, （ ） visual approach.

CCA385, 8 miles from touchdown, （ ） Tower 118.1.

Orly Approach, AFR461, FL80, estimating EML35, （ ） M.

JAL255, cleared ILS approach, runway 36, report （ ） .