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【单选题】
单相异步电动机通过单相交流电所产生的磁场是A.
旋转磁场
B.
单相脉动磁场
C.
恒定磁场
D.
均匀磁场
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反馈参考答案：
举一反三
【单选题】稳压管稳压电路适合( )的电路。
A.
（ A）负载电流小，电压变化
B.
（ B）负载电流小，电压不变
C.
（ C）负载电流大，电压不变
D.
（ D）负载电流大，电压变化
【单选题】Which one is the common subject of economic news?
A.
A person who had economic problem.
B.
A corporation that planned an economic strategy.
【单选题】持久性有机污染物的特征
A.
持久性、迁移性、高毒性、脂溶性
B.
持久性、蓄积性、迁移性、高毒性
C.
持久性、蓄积性、脂溶性、高毒性
D.
迁移性、高毒性、脂溶性、蓄积性
E.
持久性、高毒性、脂溶性、蓄积性
【单选题】According to the proponents of economic growth, which of the following statements is true?
A.
Even though economy grows at the present rate, poverty still exists in the world.
B.
Economy must grow because poverty still exists.
C.
The present rate of economic growth is too slow.
D.
Economic growth may produce the money needed to get rid of poverty throughout the world
【单选题】Which of the following terms is defined in the passage?
A.
pheromones (line 2)
B.
colony integrity (lines 11-12)
C.
mass migrations (line 14)
D.
private messages (lines 18-19)
【单选题】根据《中华人民共和国海关稽查条例》的规定，海关可以在规定期限内，对被稽查人的与进出口活动有关的账簿、单证等资料实施稽查，不受任何单位和个人的干涉。( )
A.
正确
B.
错误
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