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【单选题】
三相负载不对称时应采用的供电（）A.
△角形连接并加装中线；
B.
Y形连接；
C.
Y形连接并加装中线；
D.
Y形连接并在中线上加装熔断器
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举一反三
【简答题】鸦胆子油注射液属于
【单选题】A doctor, together with two nurses,_____sent to the mountain village.
A.
have
B.
have been
C.
has
D.
has been
【单选题】It was the third time that she_____ to this mountain village to see the children. [ ]
A.
had come
B.
has come
C.
came
D.
would come
【简答题】It was a village in India. The people were poor but they were happy. After all, their forefathers had lived in the same way for centuries. Then one day, some visitors from the city arrived. They told ...
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