7. Precision Approach Radar (PAR) is used by air traffic controllers to keep track of airplanes far away from the airport.
举一反三
- 词汇与结构 When aircraft are under radar control, air traffic controllers may replace some or all of these phases of the approach with radar____.
- When aircraft are under radar control, air traffic controllers may replace some or all of these phases of the approach with radar____. A: guidance B: services C: vectors D: controls
- 词汇与结构When aircraft are under radar control, air traffic controllers may replace some or all of these phases of the approach with radar____. A: guidance B: services C: vectors D: controls
- 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.
- Air traffic controllers in towers primarily use ______ to track and control aircraft. A: VORTAC B: NDB C: Sight D: VOR