由放射性涨落引起的误差称为()。 A.涨落误差 B.回归误差 C.标准误差 D.偶然

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问题:

由放射性涨落引起的误差称为()。

A.涨落误差

B.回归误差

C.标准误差

D.偶然误差

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题型:单项选择题

阅读理解。

     Mr and Mrs Wilson lived in a big city, and one summer they went to the country for their vacation. They enjoyed

it very much , because it was a quiet , clean place.

     One day they went for a walk early in the morning and saw an old man.   He was sitting alone in the warm sun in

front of his house. Mr Wilson asked him , " Do you like living in a quiet place?"

     The old man said, "Yes,l do. "

     Mr Wilson said,"What are the good things about it?"

     The old man answered, " Well, everybody knows everybody. People often come and see me, and I often go and

see them. And there are lots of children here. "

     Mr Wilson said, "That's interesting. And what are the bad things?"

     The old man thought for a few minutes and said, " Well, the same things , really. "

1. Where did Mr and Mrs Wilson live? 

A. In a city.              

B. In a country.

C. In town.                

D. In Beijing.

2. Why did they like the country?

A. Because it was far.

B. Because they had a farm in the country.

C. Because it was quiet and clean.

D. Because it was near.

3. Was the old man their uncle?

A. Yes , he was.                

B. We don't know.

C. I think so.          

D. Certainly.

4. What did the old man think were the good things about the country?

A. Everybody knew each other.

B. Everybody didn't know each other.

C. It was clean and quiet.

D. It was nice.

5. Did the old man think the good things and the bad things in the country were the same?

A.No,he didn't.    

B.Yes,he did.

C.I don't know.    

D.I don't think so

题型:单项选择题

下列关于慢性胃炎的描述错误的是()。

A.慢性胃炎多数表现为上腹部疼痛、饱胀、反酸、恶心、呕吐,进食后缓解

B.A型胃炎可伴有其他自身免疫性疾病

C.与饮食因素有关

D.B型胃炎内因子抗体一般为阴性

E.症状的严重程度与胃镜下表现不相符

题型:单项选择题

分离氯化钠、氯化铜、碳酸钡的混合物,在不引入新杂质的条件下,可以依次加入的一组试剂是(  )

A.水、盐酸、氢氧化钡

B.水、氢氧化钠、盐酸

C.水、硫酸、氢氧化钙

D.水、氢氧化钡、盐酸

题型:单项选择题

在健康传播过程中,作为传播行为引发者的是()

A.传播者

B.受传者

C.信息与讯息

D.传播媒介

E.传播效果

题型:单项选择题

真武汤中生姜的作用是()

A.辛温发汗

B.温胃止呕

C.辛散水湿

D.调和营卫

E.祛痰散结

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