[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f10PLlALQuJeHJgltmS8zD0WaJVHrxLJONvUcUPMob1Y":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2023-06-09 19:16:09",55563051,[8,9,10,11],"体积绝缘电阻系数 要高","耐电强度要高","介质损耗角正切值(tgδ)要大","相对介电常数 要小",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},73,"bade18fbf08ebc314a670afef7d4b82c","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F1965153f6f5efd2fba07815761982aeb.jpg","通信电缆设计与制造","exam_96340838","阶段测试2","为了保证电磁波的正常传输,关于通信电缆所用的绝缘材料的四个电气参数说法错误的是( )",[21,32,41,49,58,67,76,82,91,100],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],55563042,[25,26,27,28],"铜芯、泡沫聚烯烃绝缘、非填充式、挡潮层聚乙烯护套、双钢带铠装、聚乙烯套、市内通信电缆,包含400对导体标称直径0.5mm对绞组","铜芯、泡沫聚烯烃绝缘、填充式、挡潮层聚乙烯护套、皱纹钢带铠装、聚乙烯套、市内通信电缆,包含400对导体标称直径0.5mm对绞组","铜芯、泡沫聚烯烃绝缘、填充式、挡潮层聚乙烯护套、双钢带铠装、聚乙烯套、市内通信电缆,包含400对导体标称直径0.5mm对绞组","铜芯、实心聚烯烃绝缘、填充式、挡潮层聚乙烯护套、双钢带铠装、聚乙烯套、市内通信电缆,包含400对导体标称直径0.5mm对绞组","某电缆的型号表示为:HYFAT23 400×2×0.5,请写出其代表含义是( )","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],55563043,[36,37,38,39],"间接串音的存在并没有破坏了回路Ⅰ与回路Ⅱ之间远端串音的可逆规律,不会产生交换效应","间接串音的途径主要有两种,一是经由第三回路的间接串音,另一种是由于反射而引起的间接串音","间接串音是主串回路信号通过较复杂的间接途径串到被串回路上所形成的串音","间接串音的存在使得串音衰减减小,串音更加严重","关于通信电缆回路间的间接串音,说法错误的是( )",{"answer":42,"createTime":5,"id":43,"options":44,"question":48,"source":30,"type":31},[],55563044,[45,46,47,27],"铜芯、实心聚烯烃绝缘、填充式、挡潮层聚乙烯护套、皱纹带铠装、聚乙烯套、市内通信电缆,包含400对导体标称直径0.5mm对绞组","铜芯、泡沫聚烯烃绝缘、填充式、挡潮层聚乙烯护套、聚乙烯套、市内通信电缆,包含400对导体标称直径0.5mm对绞组","铜芯、实心聚烯烃绝缘、非填充式、挡潮层聚乙烯护套、聚乙烯套、市内通信电缆,包含400对导体标称直径0.5mm对绞组","某电缆的型号表示为:HYA 400×2×0.5,写出其表达的含义为( )",{"answer":50,"createTime":5,"id":51,"options":52,"question":57,"source":30,"type":31},[],55563045,[53,54,55,56],"减小","不变","增大","先增大后减小","通信电缆的波阻抗,随线路长度的增加将______",{"answer":59,"createTime":5,"id":60,"options":61,"question":66,"source":30,"type":31},[],55563046,[62,63,64,65],"对称通信电缆长电缆线路中,距离近端越远的段落产生的近端串音电流所遇衰减越小","连接对称通信电缆长电缆线路时,靠近增音段两端的一些电缆要选近端串音衰减值较高的,这样可以保证长线路具有较高的近端串音衰减","对于对称通信电缆长线路来说,线路较短时近端串音衰减随线路的长度的增加而减小,然后从某个长度起开始稳定下来","对称通信电缆长电缆线路的近端串音衰减值仅决定靠近近端的电缆段,与后面的电缆段关系不大","关于对称通信电缆长线路中的近端串音衰减,说法错误的是( )",{"answer":68,"createTime":5,"id":69,"options":70,"question":75,"source":30,"type":31},[],55563047,[71,72,73,74],"氟塑料护套利用聚全氟乙丙烯(FEP)挤出或聚四氟乙烯带绕包烧结,适用于-70℃ ~200℃环境下","聚氯乙烯护套具有良好耐磨、耐油酸等性能,并对火焰有自灭性,适于-40℃~+200℃环境下使用","聚氨酯护套柔软而坚韧,能在-55℃~90℃范围内保持柔软性,其耐磨性是聚乙烯的四倍,适用于耐磨性要求高的场合","聚乙烯护套不含增塑剂等助剂,不会沾污电缆的绝缘介质,使电缆电性能不劣化,适用于-55℃~+85℃环境下使用","关于同轴电缆的常用护套,说法错误的是( )",{"answer":77,"createTime":5,"id":78,"options":79,"question":81,"source":30,"type":31},[],55563048,[54,53,80,55],"不受影响","当电缆金属套电阻减小时,其理想屏蔽系数( )",{"answer":83,"createTime":5,"id":84,"options":85,"question":90,"source":30,"type":31},[],55563049,[86,87,88,89],"架空明线是对称导线组成的古老的TEM波传输线,它是在电杆上架设一对或多对导线,其中一对导线就构成一个通信回路","双线传输介质主要有架空明线、对称通信电缆","对称通信电缆和架空明线一样,也是用一对导线组成一个通信回路","架空明线的电磁场是封闭式的,不易受外界干扰和产生相互干扰,适合于传输较高频率的信号","下面关于双线传输介质的说法错误的是( )",{"answer":92,"createTime":5,"id":93,"options":94,"question":99,"source":30,"type":31},[],55563050,[95,96,97,98],"电容随外、内直径比的增大而减小.这是由于外、内导体间的距离加大,相当于电容器极板距离加大,电容减小","有效电阻与内外导体的直径比没有直接关系,而内外导体各自直径增大时,有效电阻就减小","电感随外、内导体直径的增大而减小.这是由于外、内导体间的空间面积加大,而导致磁通减小","绝缘电导外、内直径比的增大而减小.这是由于电容减小,绝缘电导与电容成正比,故也随直径比的增大而减小","关于同轴电缆的一次传输参数随电缆的外、内导体直径比的变化关系,说法错误的是( )",{"answer":101,"createTime":5,"id":6,"options":102,"question":19,"source":30,"type":31},[],[8,9,10,11]]