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【单选题】
三相三线制电路中,对称星形接法的三相电阻负载若 A 相断路,则 C 相负载流过的电流( )A.
变为零
B.
保持
C.
有效值变为原来的1.732倍
D.
有效值变为原来的0.866倍
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举一反三
【简答题】一、单项选择 1. Shyness is said to be one of the biggest _______ to friends. A. relief B. principle C. barrier D. message 2. The professor warned the students that by no means _...
【简答题】____ A) She is upset because of the professor’s rudeness. B) She is only pretending to be upset. C) She is upset because of what the professor said. D) She warned her professor not to be serious. List...
【判断题】The professor warned the author not to take statistics after he read his transcript.
A.
正确
B.
错误
【单选题】The professor warned the students that by no means _______ use mobile phones in his class.
A.
should they
B.
they should
C.
dare they
D.
they dare
【单选题】The professor warned the students that on no account _____________ use mobile phones in his class.
A.
should they
B.
they should
C.
dare they
D.
they dare
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