A.閉鎖信號(hào) B.允許信號(hào) C.跳閘信號(hào) D.都對(duì)
A.49.5Hz0.5s B.49.0Hz0.5s C.49.0Hz20s D.48.5Hz0.5s
A.35KV B.60KV C.110KV D.220KV