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【单选题】
对数字集成电路来讲，信号传播时间和高低电平转换时间不会完全被消除掉，那么，就这两者而言，可能诱发数字电路输出信号暂短逻辑错误的可能原因是（ ）。A.
信号的传播时间
B.
信号的传播时间，及从输入到输出各路输入信号历经的逻辑门数量不等
C.
高低电平转换时间
D.
高低电平转换时间，及从输入到输出各路输入信号历经的逻辑门数量不等
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举一反三
【单选题】—Why did you come by bus? ---My car broke down yesterday evening and I ____ it repaired.
A.
didn’t have
B.
don’t have
C.
won’t have
D.
haven’t had
【单选题】Why did Elias have to leave school?
A.
Because he didn’t like study.
B.
Because he was too young.
C.
Because his family was very poor.
D.
Because his school was far away from his home.
【单选题】Choose the best answer. Why did Elias have to leave school?
A.
He didn’t have a passbook.
B.
His home was far from the school.
C.
His family couldn't afford the school fees.
D.
He couldn’t read or write.
【单选题】Why did the woman have problems getting the book from the library?
A.
It wasn't published recently.
B.
It is in great demand.
C.
It was sold out already.
D.
It isn't owned by the library.
【简答题】Why did the woman have to be leaving?
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