Air traffic controllers direct the movements of all planes on the ground and in the air by ______.
A: touching different buttons in the planes.
B: sending them signals in the directing tower with flags.
C: drawing maps with pens and pencils.
D: keeping track of them on large radar screens.
A: touching different buttons in the planes.
B: sending them signals in the directing tower with flags.
C: drawing maps with pens and pencils.
D: keeping track of them on large radar screens.
举一反三
- 7. Precision Approach Radar (PAR) is used by air traffic controllers to keep track of airplanes far away from the airport.
- 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
- In the tower, there are many air traffic controllers helping take-off and landing of the _________. A:
- The air control system is based on radar, which means fewer planes can take to the skies.
- From the control tower, air traffic controllers coordinate aircraft movement both _____________ and on the ground.