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My summer (假日) is 14 days.

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It's very important for all of us to (学会) to think.

Mr. Wang went (国外) last year.

My brother wants to be a police officer. He thinks it's an (激动人心的) job.

变压器常见的额定参数有（）。

A. 额定容量
B. 额定电压
C. 额定电流
D. 额定功率
E. 额定频率