下面对病例对照研究叙述错误的是()。 A.可用于病因的探讨 B.不能计算发病率 C.

题型:单项选择题

问题:

下面对病例对照研究叙述错误的是()。

A.可用于病因的探讨

B.不能计算发病率

C.研究的资料是以往的

D.适用于研究人群中暴露比例较低的因素

E.省钱、省力、省时间且较易组织实施

考点:广东住院医师全科医学流行病学方法流行病学方法题库
题型:单项选择题

阅读理解。

     Jean is a bright young woman who comes from a rich and famous family. She goes to a good university

and has everything that money can buy. Well, almost everything. The problem is that the people in Jean's

family are so busy that they can hardly find time to be with her. In fact, Jean is quite lonely.

     So Jean spends a lot of time on her QQ. She likes being anonymous (匿名), talking to people who do not

know about her famous family and her rich life. She uses the name Linda on QQ and has made a lot of friends

who she keeps in touch with quite often.

     Last year Jean made a very special friend on QQ. His name was David and lived in San Francisco. David

was full of stories and jokes. He and Jean had a common (共同的) interest in rock music and modern dance.

So it always took them hours to talk happily on QQ and sometimes they even forgot their time. Of course,

they wanted to know more about each other. David sent a picture of himself: He was a tall, good-looking

young man with a big, happy smile. As time went by, they became good friends and often sent cards and

small things to each other.

     When Jean's father told her that he was going on a business trip to San Francisco, she asked him to let

her go with him so that she could give David a surprise for his birthday. She would take him the latest DVD

of their favorite rock singer. But when she knocked on David's door in San Francisco, she found that her

special friend was a twelve-year-old boy named Jim!

1. Jean spends a lot of her time on QQ because she is _______.

A. rich

B. famous

C. young

D. lonely

2. Jean thought "David" was special because he _______.

A. made her quite happy on QQ

B. was from San Francisco

C. sent her a picture of himself

D. was tall and good-looking

3. When Jean and "David" met and introduced themselves to each other, who felt surprised?

A."David".

B. Both "David" and Jean.

C. Jean.

D. Neither "David" nor Jean.

5. What's the main idea of the passage?

A. Don't believe those you get to know on QQ so easily.

B. People don't use their real names on QQ so often.

C. Don't go to meet those you get to know on QQ.

D. People should tell their real names to others on QQ.

题型:单项选择题

王老师有一罐茶叶,茶叶罐的高是12厘米,底面是边长为8厘米的正方形,茶叶罐侧面贴着一圈商标纸,商标纸的面积是______平方厘米,茶叶罐的体积是______立方厘米.

题型:单项选择题

市净率又称“价格收益比”或“本益比”,是每股价格与每股收益之间的比率。( )

题型:单项选择题

理论塔片数是色谱柱性能的重要指标,为了获得较高的塔片数,应当:()

A.适当加长柱长

B.选用大粒度载体

C.用粗的柱管

题型:单项选择题

内源性血液凝固过程一般开始于

A.组织细胞释放因子Ⅲ

B.血小板聚集

C.磷脂胶粒反应

D.因子Ⅻ激活

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