单选题 A radio transmitter is activated when the _______ ．

A、 pilot or controller speaks

B、 microphone is keyed

C、 set is turned on

D、 frequency is selected

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相关试题

单选题 When the controller asks the pilot to “stand by”, he means _________．

A、he knows the pilot called

B、he will get back to the pilot as soon as possible

C、the controller may be talking to someone else on a different frequency

D、al1 of the above

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单选题 In radiotelephony, the call sign for a controller in area control center is _________ ．

A、Tower

B、Ground

C、Approach

D、Control

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单选题 An aircraft at 3,000ft AGL and 69 miles from a specific VHF ground station may improve reception by _________．

A、descending to a lower altitude

B、decreasing the altimeter setting

C、increasing the volume

D、climbing to a higher altitude

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单选题 Jet stream region is an area where the wind speed is greater than _________ m/s.

A、80

B、20

C、30

D、15

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单选题 ICAO adopted a phonetic alphabet to be used in radio transmissions in order to _________ ．

A、avoid misunderstanding of letters with similar sounds

B、avoid misunderstandings of letters with different sounds

C、make letters easy to pronounce

D、make letters easy to remember

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单选题 The country indicator of civil aircraft for the People’s Republic of China is________.

A、A

B、B

C、W

D、Y

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单选题 The horizontal range for large scale weather is about _________ .

A、500～5000km

B、greater than 5000km

C、50～500km

D、less than 50km

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单选题 In radiotelephony, the call sign for a controller of aerodrome control service is__________．

A、Tower

B、Ground

C、Approach

D、Control

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