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单项选择题

自并励静止励磁系统发电机空载5%阶跃试验中,电压上升时间不大于(),振荡次数不应超过(),调节时间不应超过(),超调量不应大于()

A.1s,4次,5s,30%
B.0.5s,3次,5s,30%
C.0.5s,4次,10s,20%
D.1s,3次,10s,20%