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【判断题】
单相半波整流电路中，改变控制角大小即改变触发脉冲在每周期内出现的时刻，控制角减小，Ud减小。控制角增大，Ud增大。A.
正确
B.
错误
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举一反三
【简答题】The earliest classical books of Confucius translated into European language appeared in ______.
【简答题】红移现象
【单选题】典型慢性肺源性心脏病应具备哪一项X线表现?( )
A.
肺动脉高压、右室大
B.
肺瘀血、右室大、左房大
C.
肺充血、左、右室大
D.
肺少血、右室大、主动脉宽
E.
肺水肿，心脏普遍大
【单选题】Which is the best title of this passage?
A.
The Earliest People in North America.
B.
The Earliest Immigrants to North America.
C.
The People of the United States.
D.
Europeans Were the Earliest People Coming to the North America.
【单选题】______ is regarded as the earliest English literature of criticism.
A.
Arcadia
B.
The Defence of Poesie(Apology for Poetry)
C.
Utopia
D.
Le Morte dArthur
【简答题】红移现象
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【简答题】The earliest classical books of Confucius translated into European language appeared in ______.
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