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【单选题】
联结组别为 的变压器有利于抑制高次谐波电流，有利于低压侧单相接地短路故障的保护和切除，承受单相不平衡负荷的能力强。A.
Dyn11
B.
Yyn0
C.
Yzn11
D.
都可以
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【单选题】One night, a little before nine o'clock, Dr. Johnson was answering a telephone call. He was asked to go and give an operation to a very sick boy at once. The boy was in a small hospital in Glens Falls...
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【简答题】One night, a little before nine o’clock, Dr Johnson was answering a telephone call. He was asked to go and give an operation to a very sick boy at once. The boy was in a small hospital in Glens Falls,...
【单选题】One night, a little before nine o'clock, Dr. Johnson was answering a telephone call. He was asked to go and give an operation to a very sick boy at once. The boy was in a small hospital in Glens Falls...
A.
12 hours
B.
2 hours
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