题目内容

比较参数的两个估计量的有效性时,必须保证它们是无偏估计量.

A. 对
B. 错

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In the lobby, I noticed a foreigner ____________something to an attendant.

A. explains
B. explaining
C. explained
D. to explain

It seemed that the attendant and the foreigner _________ understand each other.

A. couldn't
B. can't
C. mustn't
D. needn't

The foreigner told me that _________ he wanted to take away was the ice in the glass.

A. who
B. whose
C. what
D. whom

The attendant handed the paper cup _______the foreigner.

A. for
B. to
C. in
D. with