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【简答题】
按规定,某车站每天 8:00~9:00,9:00~10:00都恰有一辆客车到站,但到站的时刻是随机的,且两者到站的时间相互独立.其规律为 一旅客 8:00到车站,候车时间的数学期望为______(分).
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举一反三
【单选题】A. A professor. C. A designer. B. A manager. D. An engineer.
A.
A professor.
B.
A manager.
C.
A designer.
D.
An engineer.
【简答题】adj. 健康的,有益健康的,卫生的
【简答题】19-21 Now you'll hear the two long conversations. Conversation One 19. A. She feels embarrassed when speaking in public. B. Her presentation receives a poor grade. C. She has not completed her assignm...
【简答题】听第 10 段材料,回答第 17 至 20 题。 17. What is the speaker? A . A freshman in Deep Springs College. B . An editor in the college. C . A professor in the college. 18 . What is L . L.Nunn's intention to found Dee...
【单选题】On a ____ day, our professor works in the lab from 9A.M.to 11 P.M.
A.
following
B.
typical
C.
previous
D.
diligent
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