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【单选题】
组合电路的特点是 。A.
含有记忆性器件
B.
输出与输入间有反馈通路
C.
电路输出与以前状态有关
D.
全部由门电路构成
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【简答题】Alicia: Excuse (7)______. Where is the East Baggage Claim? (8)______ need to pick our luggage up.Agent: (9)______ go straight. Turn left and then right at the elevator.Alicia: Thank you. Look. That ol...
【简答题】“Tom!” There was no answer. “Tom!” Still no answer. “Where’s that boy gone? Tom!” The old lady looked all around the room. She looked under the bed, but found only the cat. “If I catch that boy, …” sh...
【单选题】—Look at the old lady in red. Is that Mrs. Lee? —No, it _______ be her. She has gone to Canada. [ ]
A.
won't
B.
mustn't
C.
can't
D.
shouldn't
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