[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fUY8uY-at4u_daSqVMoCrWgCdOI5G3V_Br0__FbbDYvw":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":31,"type":32},[],"2024-12-07 20:45:17",169562059,[8,9,10,11],"AMI码","多进制码","HDB3码","单极性归零码",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},59,"db152c2fadebba327a9fbdc51dc416a4","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F478a08fe9045cb8995b5553cd778f91e.png","通信原理2024-2025第一学期","work_38708811","第六章(不计入总分)","低频成分少,频带比较窄,另外即使有长连0码时也能提取位同步信号编码是",[21,33,41,48,57,66,72,79,82,92],{"answer":22,"createTime":23,"id":24,"options":25,"question":30,"source":31,"type":32},[],"2024-12-07 20:45:13",169562015,[26,27,28,29],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F077c4bcc0315e1c230d88212c80a3dd8.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa4c8288a460cdb301371e1acd062c7b5.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa0370017c6ae4366790a507aef643d33.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fac2d84860e8329259d8495eeca9a4227.png\">","交变波u ( t ) 的功率谱密度的表达式为","v1",0,{"answer":34,"createTime":35,"id":36,"options":37,"question":40,"source":31,"type":32},[],"2024-12-07 20:45:16",169562026,[38,39,28,29],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd4d359a3543bef1b3c4a3403f045951e.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F9fe4e0e3f6fde606a4745d76e26c15f6.png\">","稳态波v( t ) 的功率谱密度的表达式为",{"answer":42,"createTime":5,"id":43,"options":44,"question":47,"source":31,"type":32},[],169562030,[38,45,46,29],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ffec27aaa823e4aec7b37037ef7cb94ec.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F552435162ed747236a13baed8f3c0be7.png\">","s(t)=u(t)+v(t)的功率谱密度的表达式为(交变波u(t)与基带信号s(t) 、稳态波v(t))",{"answer":49,"createTime":5,"id":50,"options":51,"question":56,"source":31,"type":32},[],169562037,[52,53,54,55],"u(t)=s(t)−v(t)","u(t)=s(t)+v(t)","u(t)=s(t)×v(t)","u(t)=s(t)÷v(t)","交变波u(t)与基带信号s(t) 、稳态波v(t)之间的关系",{"answer":58,"createTime":5,"id":59,"options":60,"question":65,"source":31,"type":32},[],169562045,[61,62,63,64],"s(t)=u(t)−v(t)","s(t)=u(t)+v(t)","s(t)=u(t)×v(t)","s(t)=u(t)÷v(t)","基带信号s(t) 与交变波u(t),稳态波v(t)之间的关系",{"answer":67,"createTime":5,"id":68,"options":69,"question":71,"source":31,"type":32},[],169562049,[8,70,11,10],"双极性归零码","在"0"、"1"等概率出现情况下,包含直流成分的码是",{"answer":73,"createTime":5,"id":74,"options":75,"question":78,"source":31,"type":32},[],169562055,[8,76,11,77],"单极性不归零码","以上答案都不对","即使在"0"、"1"不等概率出现情况下,以下哪种码仍不包含直流成分",{"answer":80,"createTime":5,"id":6,"options":81,"question":19,"source":31,"type":32},[],[8,9,10,11],{"answer":83,"createTime":84,"id":85,"options":86,"question":91,"source":31,"type":32},[],"2024-12-07 20:45:18",169562061,[87,88,89,90],"1001011110101010","1001011110101011","0101011110101010","1001011110011010","如果AMI码为+100-10+1-1+1-10+10-10+1-1,那么其对应的消息代码为",{"answer":93,"createTime":84,"id":94,"options":95,"question":97,"source":31,"type":32},[],169562063,[8,96,10,11],"CMI码","以下4种传输码型中含有直流分量的传输码型是"]