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问题 单项选择题 A1型题

均数与标准差适用于（）。

A.正偏态分布

B.负偏态分布

C.正态分布

D.偏态分布

E.不对称分布

答案

参考答案：C

解析：均数与标准差分别用于描述数值变量资料的集中及离散趋势，适用于正态分布或近似正态分布资料。

阅读理解

根据短文内容,判断下列句子正(T)误(F).

    David Smith is a doctor. But he is not a doctor who helps sick(病的)people. He helps fish. So everyone calls him" The Fish Doctor". If their pet(宠物)fish get sick, they call him on the telephone. David drives his   truck to the people's house. In the truck ,he has medicine to help the sick fish to get better.

    Sometimes a pet store calls David when there are sick fish .Wherever(无论哪里)he goes, "The Fish

Doctor" is always welcome.

(  )1.The best title is "The Fish Doctor".

(  )2.David goes to people's house in a car.

(  )3.People telephone David when their cats are sick.

(  )4.David is a very kind man.

(  )5.You can know from the story that people love their pet fish.
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单项选择题

溃疡性结肠炎患者的粪便可呈（）

A.黏液便

B.脓血便

C.鲜血便

D.米泔水样便

E.柏油样便
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