【单选题】
_______ is a service provided to notify appropriate organizations regarding aircraft in need of search and rescue aid, and assist such organizations as required.___
A. alerting service
B. information service
C. rescue service
D. assistance service
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答案
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Visibility is the ability as determined by atmospheric conditions and expressed in unit______.___
A. meters
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【单选题】
SIGMET is a weather advisory issued concerning weather______to the safety of all aircraft.___
A. significant
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Air traffic means all aircraft in flight or operating on the______of an aerodrome.___
A. highway
B. hanger
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D. terminal
【单选题】
The true airspeed is the airspeed of an aircraft relative to______air.___
A. turbulence
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【单选题】
Air speed is the speed of an aircraft relative to its surrounding______.___
A. traffic
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“Aircraft” means any machine that can derive support in the______from there actions of the air other than there actions of the air against the earth's surface.___
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【单选题】
If the radar receiver detects the retarding time tR＝500mS between transmitting pulse and receiving pulse,now the target is______km from the radar station.___
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【单选题】
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【单选题】
The recommendation is advisory in nature.The decision as to whether the flight can be conducted safely rests solely with the______.___
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“______”is a notice containing information concerning the establishment,condition or change in any aeronautical facility service procedure or hazard,the timely knowledge of which is essential to personnel concerned with flight operations.___
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管制员在对空指挥过程中，应当主动地控制一句管制指令中所包含的管制指令的内容。一般情况下，管制员发布的一句管制指令中，包含的管制内容不应当超过___项
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________is the ratio of true air speed to the speed of sound.___
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_______is a specified area within or over which there may exist activities constituting a potential danger to aircraft___
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