[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fnfblN_Iu6kwa6gcfRty2hxAPNmNP23SYS96R2tOE18E":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2025-11-20 19:41:34",237976226,[8,9,10,11],"数据压缩","数据加密","传输比特流","差错控制",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},10,"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","work_48018340","作业02","物理层的主要功能是()",[21,32,41,50,53,62,71,80,89,98],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],237976223,[25,26,27,28],"600波特","1200波特","4800波特","9600波特","若某通信链路的数据传输速率为2400bit\u002Fs,采用4相位调,制,则该链路的波特率是( )｡","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],237976224,[36,37,38,39],"00110110","10101101","01010010","11000101","若图2.26为10BaseT网卡接收到的信号波形,则该网卡收到,的比特流是( )｡\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa1d0759d446ec663e164dce222067508.png\">",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],237976225,[45,46,47,48],"NRZ和曼彻斯特编码","NRZ和差分曼彻斯特编码","NRZI 和曼彻斯特编码","NRZI和差分曼彻斯特编码","下图所示,编码1和编码2分别是( )｡ \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F222af7316177d6582800a5e14d8430c7.png\">",{"answer":51,"createTime":5,"id":6,"options":52,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":54,"createTime":5,"id":55,"options":56,"question":61,"source":30,"type":31},[],237976227,[57,58,59,60],"调制解调器","网桥","中继器","交换机","在物理层中,用于传输数字信号的设备是()",{"answer":63,"createTime":5,"id":64,"options":65,"question":70,"source":30,"type":31},[],237976228,[66,67,68,69],"10米","100米","1000米","2000米","RS-232标准规定的传输距离一般不超过()",{"answer":72,"createTime":5,"id":73,"options":74,"question":79,"source":30,"type":31},[],237976229,[75,76,77,78],"ASCII码","EBCDIC码","曼彻斯特编码","二进制编码","物理层协议中,常用的编码方式是()",{"answer":81,"createTime":5,"id":82,"options":83,"question":88,"source":30,"type":31},[],237976230,[84,85,86,87],"USB","HDMI","VGA","Ethernet","物理层标准中,常用的接口类型是()",{"answer":90,"createTime":5,"id":91,"options":92,"question":97,"source":30,"type":31},[],237976231,[93,94,95,96],"双绞线","同轴电缆","光纤","无线电波","不受电磁干扰和噪声影响的传输介质是()",{"answer":99,"createTime":5,"id":100,"options":101,"question":106,"source":30,"type":31},[],237976232,[102,103,104,105],"bps","Kbps","Mbps","Gbps","物理层的主要传输速率单位是()"]