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【单选题】
如图所示为正弦交流电路,已知电源电压为 220V ,当频率为 50Hz ,电路发生谐振,现将电源的频率增加为 60Hz ,电压有效值不变,则电流 i 将 。A.
变大
B.
变小
C.
不变
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反馈参考答案：
举一反三
【简答题】设全集U＝{a，b，c，d，e}，A＝{a，c，d}，B＝{b，d，e}，则? U A∩? U B＝________.
【单选题】The decisions made by financial managers should all be ones which increase the:
A.
size of the firm
B.
growth rate of the firm
C.
marketability of the managers
D.
market value of the existing owners' equit
E.
firm's current sales
【单选题】I don't know if Chris is right for the job--he doesn't really possess the skills that ______ a good manager.
A.
mark
B.
represent
C.
signal
D.
symbolize
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