单项选择题
在变压器中,同时和一次绕组、二次绕组相交链的磁通称为主磁通。
A、正确
B、错误
在变压器中,同时和一次绕组、二次绕组相交链的磁通称为主磁通。
A、正确
B、错误
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单项选择题
I wish I could ________ and relive my schooldays; I regret not having tried harder and passed more exams.( )
I wish I could ________ and relive my schooldays; I regret not having tried harder and passed more exams.( )
A.put the clock back
B.do without
C.cut off
D.put across