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【单选题】
脉冲的下降时间越长,表示脉冲的()。A.
后沿下降得越快
B.
后沿下降得越慢
C.
周期短
D.
周期长
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【单选题】The boys always stays here for _________>
A.
one and half hour
B.
one and half a hour
C.
one and a half hours
D.
one and half hours
【简答题】This passage can be divided into 3 parts. Part two is from paras.5-10. What is the main idea of this part ?
【简答题】请下面一段材料，回答第1-3题。 1. What is the main purpose of the talk? A. To give a prize to a musician. B. To introduce a guest speaker. C. To invite a musician to a concert. 2. At what age did the pianist begin ...
【单选题】Mary is old. [ ]
A.
one and a half year
B.
one and a half years
C.
one and half year
D.
one year and half
【单选题】This is a typical emitter follower. What is the main benefit obtained by use of an emitter follower?
A.
The collector can be connected to as high voltage as 10 V DC.
B.
The V out is always equivalent to the V in.
C.
The input impedance is made much larger than the output impedance.
D.
The input impedance is made much smaller than the output impedance.
【简答题】what is the main idea of part III(8-10)?
【简答题】Henry walked for OD_e hour and a half to get home． →It______Henry one hour and a half to walk home．
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