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【单选题】
随机变量X服从两点分布，X所有可能取值为0和m, P(X=m)=0.7, E(X)=1, 问m为多少A.
7/10
B.
7/3
C.
3/7
D.
10/7
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反馈参考答案：
举一反三
【简答题】, people buy a large number of tokens at a time. this is a pratice here. (general)
【简答题】Fill in the blanks with the right form of the word povided at the end of each sentence. 1 In a _____ country, we need to know the ____ of culture so as to act in a polite way. (differ) 2 My boss is a ...
【单选题】Nowadays a large number of people buy ______ Christmas trees instead of real ones.
A.
false
B.
artificial
C.
synthetic
D.
manual
【简答题】______, people buy a large number of tokens at a time. This is a ______ practice here. (general)
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