A.(50±2)Ae B.(60±4)Ae C.(70±5)Ae D.(80±7)Ae
A.0.1s B.0.3s C.0.5s D.1s
A.經(jīng)濟(jì)電流密度 B.允許載流量 C.機(jī)械強(qiáng)度 D.發(fā)熱條件