[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fqayes5-26b3JMJTau2Tgv8fO-A12fJF4HRZa0z-dptc":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":31,"type":32},[],"2024-01-02 12:43:46",125490345,[8,9,10,11],"短波","超短波","微波","中长波",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},92,"6ea9699db850e7a8d84263b9ce17bcb6","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F7e2d5ad53be3d12aacc56ee37db405b7.jpg","高频电路","work_31976918","期末复习1","地球与卫星之间主要是应用什么( )通信",[21,33,38,43,53,62,69,78,87,90],{"answer":22,"createTime":23,"id":24,"options":25,"question":30,"source":31,"type":32},[],"2024-01-02 12:43:44",125490323,[26,27,28,29],"双线对电缆(双绞线)","同轴电缆","光纤","自由空间(空气)","不是有线通信传输媒介的是( )","v1",0,{"answer":34,"createTime":23,"id":35,"options":36,"question":37,"source":31,"type":32},[],125490325,[9,8,10,11],"高频(HF)工作在3-30MHz,又可以称之为( )",{"answer":39,"createTime":23,"id":40,"options":41,"question":42,"source":31,"type":32},[],125490327,[8,9,10,11],"天波适用于( )波段传播",{"answer":44,"createTime":45,"id":46,"options":47,"question":52,"source":31,"type":32},[],"2024-01-02 12:43:45",125490331,[48,49,50,51],"3*10^8","3*10^5","3*10^6","3*10^7","真空中的光速为( )m\u002Fs",{"answer":54,"createTime":45,"id":55,"options":56,"question":61,"source":31,"type":32},[],125490332,[57,58,59,60],"10米","1米","0.1米","0.01米","在空气中,3GHz频率的无线电,所对应的波长为( )",{"answer":63,"createTime":45,"id":64,"options":65,"question":68,"source":31,"type":32},[],125490335,[66,57,58,67],"100米","1000米","在空气中,30MHz频率的无线电,所对应的波长为( )",{"answer":70,"createTime":5,"id":71,"options":72,"question":77,"source":31,"type":32},[],125490337,[73,74,75,76],"中长波(1.5MHz以下)","声波","短波(3-30MHz)","超短波(30-300MHz)","在无线电传输中,地波是沿地面传输的波,请问,以下哪个波适合地波传输",{"answer":79,"createTime":5,"id":80,"options":81,"question":86,"source":31,"type":32},[],125490341,[82,83,84,85],"电离层","空气层","真空层","氧气层","无线电传输中,天波是利用( )层来实现电磁波的反射",{"answer":88,"createTime":5,"id":6,"options":89,"question":19,"source":31,"type":32},[],[8,9,10,11],{"answer":91,"createTime":92,"id":93,"options":94,"question":99,"source":31,"type":32},[],"2024-01-02 12:43:47",125490348,[95,96,97,98],"10","100","1000","10000","1GHz=( )MHz"]