A．Has never been to his friend's house.B．Has been to his friend's house before.C．Used
A. Has never been to his friend's house.
B. Has been to his friend's house before.
C. Used to go to his friend's house a lot.
D. Often goes to his friend's house.
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This passage mainly deals with how Emery Tobin made his magazine famous all over the United States.
A. Y
B. N
C. NG
A．She was sick.B．She lost her job.C．She said goodbye to her boyfriend.D．She failed in
A. She was sick.
B. She lost her job.
C. She said goodbye to her boyfriend.
D. She failed in the interview.
8751单片机内有4KB EPROM，如果从内部EPROM取指令必需将1个引脚作适当连接，即()
关于随机变量特征数的表达式不正确的是()。
A. E(aX+b)＝aE(X)+b
B. F(X1+X2)＝E(X1)+E(X2)
C. var(X1±X2)=var(X1)+var(X2)
D. var(aX+b)＝avar(X)
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