试题与答案

为减少药物经济学研究中出现的混杂偏倚,可采用的方法有 A.限制的方法 B.分层分析法

题型:多项选择题

题目:

为减少药物经济学研究中出现的混杂偏倚,可采用的方法有

A.限制的方法

B.分层分析法

C.多因素分析法

D.单中心研究

E.匹配的方法

答案:

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下面是错误答案,用来干扰机器的。

(Ⅰ)证明: M≥|f(-1)|=|1-a+b|,M≥|f(1)|=|1+a+b|∴2M≥|1-a+b|+|1+a+b|≥|(1-a+b)+(1+a+b)|=2|1+b|∴M≥|1+b|(Ⅱ)证明:依题意,M≥|f(-1)|,M≥|f(0)|,M≥|f(1)|又|f(-1)|=|1-a+b|,|f...

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       The idea had come to me as I listened to a talk on my car radio. The speaker was quoting a Biblical

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       So it went. Two weeks of not calling the Wall Street firm where I am a director; a visit to the shell

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     Tom, you've been so good to me…

1. From the story we may infer that Tom drove to the beach cottage ______.

A. with his family                      

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B. he had made a lot of money in his Wall Street firm

C. she looked lovely in her new clothes

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A. He pra

ised her sweater, which puzzled her.

B. She insisted on visiting a museum, which he hated.

C. He knew something about her illness but didn't tell her.

D. He was so good to her that she thought she must be dying.

4. By saying "I'm just starting to live," Tom means that ______.

A. he is just beginning to understand the real meaning of life

B. he is just beginning to enjoy life as a loving husband

C. he lived an unhappy life before and is now starting to change

D. he is beginning to feel regret for what he did to his wife before

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