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【简答题】
2设随机变量 X ～ U (0,10)，求(1) X 的概率密度；(2) P { X <3}；(3) P { X ≥6}。
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举一反三
【单选题】Do you have ________to do the work ________?
A.
enough time, good enough
B.
time enough, enough good
C.
enough time, well enough
D.
time enough, enough well
【单选题】If you _______nature and do things at the wrong time of year, you will have to do more work and the results will not be so good.
A.
go after
B.
go away with
C.
go in for
D.
go against
【单选题】What time do you usually _____ in the morning? [ ]
A.
have a breakfast
B.
have breakfast
C.
have the breakfast
D.
have breakfasts
【简答题】What must you do to have plenty of time to eat breakfast? We must ______ to have plenty of time to eat breakfast.
【单选题】--- Do you have the time? --- ______
A.
Yes, I do.
B.
No, I don’t
C.
Twenty past eight.
D.
Surely, I have a watch.
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