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【单选题】
三相交流电是指由三个频率相同、电势振幅相等、相位互差（）的交流电路。A.
60°
B.
90°
C.
120°
D.
180°
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反馈参考答案：
举一反三
【简答题】教材P49题5
【单选题】According to the passage, American education meets the needs of all the following EXCEPT
A.
the brightest students.
B.
the slow students.
C.
the students from foreign countries.
D.
the immigrants.
【简答题】作为消费者市场细分的依据，教育程度属于（ ）。
【简答题】According to the passage, American education meets the needs of all the following EXCEPT
【单选题】In the passage, it's said that hackers may attack the Internet system of all the following institutions except
A.
banks
B.
telephone companies
C.
universities
D.
government departments
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