题目内容
在设计时采用哪种方法可适当的控制病例对照研究中的混杂偏倚
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甲、乙两地女性宫颈癌标化死亡率相同，甲地死亡率高于乙地死亡率，由此可知
One silly question I simply can’t understand is "How do you feel" Usually the question is asked of a man in action—a man on the go, walking along the streets, or busily working at his desk. So what do you expect him to say He’ll probably say, "Fine, I’m all right," but you have put a bug (小虫子) in his ear—maybe now he’s not sure. If you are a good friend, you may have seen something in his face, or his walk, that he overlooked (忽略) that morning. It starts worrying him a little. First thing you know, he looks in a mirror to see if everything is all right, while you go merrily on your way asking someone else "How do you feel" Every question has its time and place. It’s perfectly acceptable, for instance, to ask "How do you feel" if you’re visiting a close friend in the hospital. But if the fellow is walking on both legs, hurrying to take a train, or sitting at his desk working, it’s no asking him that silly question.When George Bernard Shaw, the famous writer of plays, was in his eighties, someone asked him, "How do you feel" Shaw put him in his place. "When you reach my age," he said, "either you feel all right or you’re dead.\ George Bernard Shaw’s reply in the passage shows his ().
病例对照研究的资料是
1987年下半年，海口市率先开展土地使用权有偿出让和转让的试点，做法是国家出让土地使用权及允许进行土地使用权抵押。 ( )
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