问题:通常所说的电流方向,实际是指电路中电荷的流向,一般规定在外电路中...
Tuesday, September 13, 2022
Sunday, December 3, 2023
问题:全塑电缆的屏蔽层应全程连接通,其主干电缆屏蔽层连通电阻不大于2.6Ω/km。...
Sunday, December 11, 2022
问题:拉线主要采用钢绞线做拉线,通常有哪几种规格()A、7/1.6B、7/2.6C、7/2.8D、7/3.0...
Wednesday, August 16, 2023
Sunday, December 3, 2023
问题:0.4mm线径在20℃时单线直流电阻值为()Ω/km。A、236B、95C、148D、36.6...
Wednesday, December 6, 2023
问题:地下管道电缆内经常保持气压在()kpa范围内。A、30~80B、40~70C、35~80D、50~60...
Wednesday, August 16, 2023
问题:木杆上装设避雷线可直接用卡钉钉固,卡钉间距为()mm。...
Wednesday, December 6, 2023
问题:电缆模块型接线子接续规定:接续配线电缆芯线时,模块下层接()线。...
Sunday, January 28, 2024
Sunday, September 11, 2022
Tuesday, September 13, 2022
Monday, June 12, 2023
问题:装设在跨越铁路、河流等跨越杆上的三条拉线,设置形式有以下几种()A、互成60度角B、互成120度角C、互成90度角D、双方拉线加1个顺线拉线...
Sunday, January 28, 2024
问题:停止送电时必须在开关处悬挂停电警示标志,有专人值守,严禁擅自送电。...
Wednesday, August 16, 2023
Sunday, September 11, 2022
问题:当通信线与电力线接触或电力线落在地面上时,必须立即停止一切有关作业活动,方能离开现场。...
Wednesday, November 23, 2022
问题:属于用户线路的有()A、局配线架至交换机电缆B、用户引入线C、楼内暗配线D、架空电缆...
Thursday, March 14, 2024
Tuesday, September 13, 2022
问题:采用机械(电缆敷设机)敷设光(电)缆,必须事先清除光(电)缆路由...
Sunday, September 11, 2022
问题:电缆模块型接线子接续规定:接续配线电缆芯线时,模块下层接()线。...
Sunday, January 28, 2024