单项选择题

单相变压器测定原、副方极性时，若首端为同名端，则有（）。
A、
B、
C、

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单项选择题

How was Mr. Holland’s teaching the first day in school?
A、It was very successful.
B、Students liked him very much.
C、He felt frustrated by the bad performance of the students.
D、He was very satisfied with the performance of the students.