单项选择题

A _______ political and economic situation is very important for the development of any country.

A、stain
B、stable
C、peaceful
D、pink

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单项选择题

如图2所示一升压变压器，其额定容量为31.5MVA，变比为10.5/121±2×2.5%，归算到高压侧面的阻抗，已知在最大负荷和最小负荷时通过变压器的功率，。高压侧调压要求，发电机电压的可调整范围为10～11kV，试选变压器分接头。

(3)最小负荷时所要求的分接头电压为()。
A.
B.
C.
D.

单项选择题

When he learned he had passed the exam, Tom _____ song.

A、broke out
B、broke in
C、broke into
D、broke through