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【单选题】
⑦由集成定时器555构成的多谐振荡器如图10.34所示，要使振荡频率降低，可采取( )。A.
增加C
B.
减小R 1 ，及R 2
C.
降低电源电压U cc
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举一反三
【单选题】What can we infer from the passage?
A.
Over the last two decades, colleges altered the composition of their work force.
B.
In the past twenty years, the number of full-time instructors increased by 630,000.
C.
All the managerial positions added during the period from 1987 to 2007 were full time.
D.
There were altogether 614,000 teaching positions in the United States in 2007.
【单选题】听力原文：W: You don't look too happy. What's the problem? M: Well, rye got to write a composition for my English class, and I just can't come up with any idea, and it's due tomorrow. Q: What is the man's ...
A.
He has to change the topic for his composition.
B.
He has fallen behind others in English class.
C.
He hasn't made up his mind as to what to write about.
D.
The book he borrowed will be due tomorrow.
【简答题】理想信念的特点有:( )
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