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问题:

[单选] 两封信随机地投入标号为1,2,3,4的4个邮筒,则1,2号邮筒各有一封信的概率.等于

两封信随机地投入标号为1,2,3,4的4个邮筒,则1,2号邮筒各有一封信的概率.等于

问题:

[单选] 下列说法正确的是

下列说法正确的是

问题:

[单选] 设A和B为两事项件,0<P(A)<1,则下述结论中错误的是(  )

设A和B为两事项件,0<P(A)<1,则下述结论中错误的是(  )

问题:

[单选] 两封信随机地投入标号为1,2,3,4的4个邮筒,则1,2号邮筒各有一封信的概率等于

两封信随机地投入标号为1,2,3,4的4个邮筒,则1,2号邮筒各有一封信的概率等于

问题:

[单选] 下列函数中,在x=0处不可导的是(  )

下列函数中,在x=0处不可导的是(  )

问题:

[单选] 函数y=f(x)在点x=x0处取得极大值,则必有(  )

函数y=f(x)在点x=x0处取得极大值,则必有(  )

问题:

[单选] Have you ever been to the museum_________ was built last year?

Have you ever been to the museum_________ was built last year?

问题:

[单选] You can borrow that bicycle if you________.

You can borrow that bicycle if you________.

问题:

[单选] I always regretted not_________ harder when l was young.

I always regretted not_________ harder when l was young.

问题:

[单选]

A . what
B . water
C . watch
D . want
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