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【单选题】
在RLC串联电路中，发生串联谐振时（）。A.
电感电压和电容电压有效值相等，并电压有效值
B.
电感电压和电容电压有效值相等，并低于总电压有效值
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】牙周病的维护期应进行的内容是
A.
长期服用抗菌素
B.
有问题出现时再进行复查
C.
定期牙周检查和洁治
D.
只针对口腔卫生差的人进行宣教
E.
复查时应每2个月拍X线片
【单选题】Which of the following is NOT the problem the American blacks had to face according to the passage?
A.
Inadequate schools for children.
B.
Unstable families.
C.
High employment rate.
D.
Children taking drugs.
【简答题】American blacks are said to be the _________ of African slaves.
【简答题】A．There are more American Indians than Blacks in the U. S. B．A large portion of American Blacks now live in the southwest. C．The first immigrants to America were English and Dutch. D．African Blacks ca...
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