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

A、Tower

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

A、A

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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 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 Constant attention to correct phraseology and procedures will _________ ．

A、result in their use becoming automatic

B、ensure a high standard of radio transmissions

C、contribute to the safety of operations

D、bring about all 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

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A、80

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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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