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单选题 which one of the following statements about HF is correct
学科：民航英语阅读 Aviation English for ATC: Reading Course
时间：2024-05-19 01:55:20
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题目1单选题
which one of the following statements about HF is correctA. HF is used for long-range communicationB. HF signals are subject to the line of sightC. HF radio waves can not travel straight forwardD. HF is used by most of the en route air traffic units
题目2单选题
what communication equipments are available for air traffic controllers to communicate with pilotsA. overhead speaker,telephone,boom mikeB. telephone,boom mike,headsetC. boom mike,headset,overhead speakerD. headset,telephone,overhead speaker
题目3单选题
what is the function of voice switching systemA. it allows controllers to move around the facility freelyB. it makes the communication systems sophisticatedC. it assists the controllers to change his or her communication counterpartsD. it requires the landline communication always be routed to an overhead speaker
题目4单选题
which of the following statements about radio communication is TrueA. every controller has his/her own dedicated frequencyB. the radio frequencies assigned to the controllers in the same facility are interchangeableC. the radio frequencies used for aeronautical communication are chosen by air traffic controllersD. air traffic control units also use radios to communicate with each other
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