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【单选题】
单相半波可控整流电路,在感性负载的情况下,若一个周期内流过晶闸管的平均电流等于流过续流二极管的电流时,晶闸管的导通角应为( )。A.
120 °
B.
180 °
C.
90 °
D.
60 °
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【单选题】We can learn from Paragraph 4 that______.
A.
ships without crew will soon replace traditional ones
B.
most air crashes are caused by operational mistakes
C.
erewless ships are favoured just because of safety
D.
human hands are more reliable than computers
【简答题】阅读理解 In a world with limited land,water and other natural resources,the harm from the traditional business model is on the rise.Actually,the past decade has seen more and more forests disappearing and...
【单选题】Computer newspapers have many advantages, except ______.
A.
they are cheaper than traditional newspapers
B.
they are very convenient to use
C.
you can get more information from them quickly
D.
you can easily save information for future use
【单选题】It can be learned from the passage that Esquith's students ______.
A.
enjoyed the traditional teaching better
B.
were mainly from immigrant families
C.
had relatively lower intelligence level
D.
refused to cooperate with the new teacher
【单选题】Today the study of language in our schools is somewhat confused. It is the most traditional of scholastic subjects being taught in a time when many of our traditions no longer fit our needs. You to wh...
A.
spoken in English, Denmark, Spain, and Hawaii
B.
less than the size of the language spoken by Eskimos
C.
inestimable
D.
irrelevant
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