单选题 When an aircraft station fails to establish contact with the aeronautical station on the designated frequency, it shall _______ ．

A、 attempt to establish contact on another frequency appropriate to the route

B、 attempt to establish communication with other aircraft or other aeronautical stations on frequencies appropriate to the route

C、 transmit its message twice on the designated frequencies, preceded by the phrase “Transmitting blind”

D、 any one of the above procedures that is practicable

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

A、500～5000km

B、greater than 5000km

C、50～500km

D、less than 50km

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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 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 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 The country indicator指示器 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 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 of aerodrome control service is__________．

A、Tower

B、Ground

C、Approach

D、Control

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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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