A.允許載流量B.機(jī)械強(qiáng)度C.經(jīng)濟(jì)電流密度D.熱穩(wěn)定
A.0.38kVB.35kVC.110kVD.220kV
A.架空線路B.電纜線路C.金屬管道D.接地線路