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【单选题】
下列逻辑电路中是时序逻辑电路的是 。A.
译码器
B.
加法器
C.
计数器
D.
编码器
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举一反三
【简答题】What conditions does Victor give before considering the deal?
【单选题】— How long has the man been waiting? — He _____ for 20 minutes. [ ]
A.
has been waiting
B.
is waiting
C.
was waiting
D.
will wait
【简答题】听下面一段材料,回答第1-3题. 1. How long has the man stayed in the hotel by now? A. As long as fif minutes B. Less than a quarter of an hour. C. Less than ten minutes. 2. Why does the man complain to the rece...
【单选题】Under what conditions does the E. coli lactose operon have the highest transcription activity?
A.
High lactose, low glucose
B.
High lactose, high glucose
C.
Low lactose, low glucose
D.
Low lactose, high glucose
【简答题】白塔有哪些象征性数字?
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