[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f2lcOagW8CKbjsxfPLvnLzdktipzr9wQVG5p5ixdX9YY":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2024-05-19 09:55:20",144532835,[8,9,10,11],"overhead speaker,telephone,boom mike","telephone,boom mike,headset","boom mike,headset,overhead speaker","headset,telephone,overhead speaker",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},4,"e2298efc847bcaaea92453ccf7a845b2","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F010c99a6af8b621f26d4612a4a3a26cf.png","民航英语阅读 Aviation English for ATC: Reading Course","work_34943694","Lesson 10 multiple choices:para 4-6","what communication equipments are available for air traffic controllers to communicate with pilots",[21,32,35,44],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],144532834,[25,26,27,28],"HF is used for long-range communication","HF signals are subject to the line of sight","HF radio waves can not travel straight forward","HF is used by most of the en route air traffic units","which one of the following statements about HF is correct","v1",0,{"answer":33,"createTime":5,"id":6,"options":34,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":36,"createTime":5,"id":37,"options":38,"question":43,"source":30,"type":31},[],144532836,[39,40,41,42],"it allows controllers to move around the facility freely","it makes the communication systems sophisticated","it assists the controllers to change his or her communication counterparts","it requires the landline communication always be routed to an overhead speaker","what is the function of voice switching system",{"answer":45,"createTime":5,"id":46,"options":47,"question":52,"source":30,"type":31},[],144532838,[48,49,50,51],"every controller has his\u002Fher own dedicated frequency","the radio frequencies assigned to the controllers in the same facility are interchangeable","the radio frequencies used for aeronautical communication are chosen by air traffic controllers","air traffic control units also use radios to communicate with each other","which of the following statements about radio communication is True"]