临时用电线路,应采取架空方式安装,并满足哪些要求?
4G上网流量套餐有以下哪些档次?() ["50元","70元","100元","130元","180元"]
以下哪两种4G流量套餐作为4G主体套餐的补充?() ["4G上网流量套餐","4G飞享套餐","4G上网叠加包","4G无线宽带套餐(数据类终端专用)"]
单相3线插座接线有严格规定() ["“左零”“右火”","“左火”“右零”"]
4G飞享套餐有以下哪些档次?() ["128元","138元","228元","238元","328元","338元"]
变配电站(室)和变配电设备主要危险有哪些?