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【判断题】
已知连续型随机变量【图片】的概率密度函数为【图片】，【图片】为常数，则【图片】.A.
正确
B.
错误
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【简答题】Do you often feel weak or tired when you get up in the morning? Do you often wake up with a headache? Well, if the answer is yes, take Dr. Talbot’s advice (建议) and start feeling better. Get up and mov...
【单选题】Granny is sleeping. You’d better __________.
A.
not wake up her
B.
not to wake up her
C.
not wake her up
D.
not to wake her up
【简答题】阅读理解。 Linda used to wake you up on Sunday morning when you wanted to stay in bed, but now you will feel strange if she gets up before lunch. She used to be very quiet, but now she talks all the time-b...
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