下列哪种偏倚不是病例对照研究中的偏倚（） A.住院偏倚 B.回忆_爱下问搜题

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问题单项选择题 A1型题

下列哪种偏倚不是病例对照研究中的偏倚（）

A.住院偏倚

B.回忆偏倚

C.选择性转诊偏倚

D.失访偏倚

E.混杂偏倚

答案

参考答案：D

填空题

阅读短文，从方框中选择适当的单词填空。

aim but fun also with

The London Olympic Games is still a few months away. But in the US, kids had 小题1:___________ in a mini-Olympics competition.
Michelle Obama（米歇尔.奥巴马）, the First Lady of the US, held the games. Children played basketball 小题2:_________ four-time gold medalist(金牌得主) Lisa Leslie. They 小题3:___________ played soccer and tennis with famous players. The 小题4:_________ of the competition was to teach kids the Olympic spirit(精神). “The most important thing is not to win, 小题5:_________ to take part.” The First Lady said. How meaningful it is!

填空题

气门间隙（），会使气门的升程减小，引起充气不足和排气不畅。