A.Because she met a heavy traffic on her way.
B.Because a terrible car accident happened to her.
C.Because she had taken a different road.
D.Because the road was closed and she had to wait.
第7题
三段式零序电流保护中第I段为()。
A.瞬时零序电流速断保护
B.限时零序电流速断保护
C.零序过电流保护
第9题
三段式零序电流保护中第III段为()。
A.瞬时零序电流速断保护
B.限时零序电流速断保护
C.零序过电流保护
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