在额定高度以上，螺旋桨有效功率随飞行高度的增加将（）。

“VMC” means “（ ）”.

We call the man who will be in charge for the whole affairs of airliners in the Airport station as （ ） .

Who will be in charge for a flight?

“APU” is （ ） .

“GPU” is “Ground Power （ ） ”.

“Tug” carries the aircraft’s （ ） on its platform for aircraft maneuvering when the aircraft engines inoperative.

“Mobile belt conveyors” is a vehicle which can lift （ ） up to aircraft, and be raised at both ends.

Airport elevation is measured at the （ ） usable landing surface on the airport.

（ ） enables traffic to move to and from runways without interfering with aircraft taking off or landing.

The basic markings on runways used for VFR operations consist of runway direction numbers and （ ） markings.