单项选择题
A.5-6ms B.7-11ms C.8-11ms D.8-13ms
A.持续，80%额定容量下持续或20min B.持续，20s C.80%额定容量下持续或20min，20s D.持续，30s
A.1100kV B.1050kV C.1000kV D.1150kV
A.20% B.30% C.40% D.50%
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