当变压器发生少数绕组匝间短路时，匝间短路电流很大，因而变压器瓦斯保护和纵差保护都会动作跳闸（)
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George said nothing. He gazed at the distance, deep in thought.（)
I'll write the message so as （to not) forget.（)
Everyone in our class went to the international book fair.（)
Joan is working at the emergency room of the hospital （attached in) the Beijing Medical School.（)
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