“空中交通管制”可以表达为"_____". A: air traffic warning B: air traffic control C: traffic control D: air traffic clearance

The separation of air traffic is the responsibility of air traffic controllers, utilizing the tools at their ________.

与当地空中交通管制员联系。 A: Speak to the local air traffic controller. B: Ask the local air traffic controller. C: Talk to the local air traffic controller.

Air traffic control provides traffic ______ services to the aircraft on a time permitting basis.

4. From the control tower, air traffic controllers coordinate aircraft movement both ________ and on the ground. A: on the air B: in the air C: at the air D: of the air

The volume of scheduled flights is ________ the air traffic control system.

There is far less traffic on the road and the air is much _______(fresh)

Which factor does the air cargo rates not affect A: Volume of traffic B: Airport scale C: Direction of traffic D: Characteristics of the traffic

In the tower, there are many air traffic controllers helping take-off and landing of the _________. A:

The study says there must be a complete ______ of air traffic control systems.