急性坏死性胰腺炎并发休克的原因有（）。 A.体液丧失 B.心肌抑制因子 C.胰蛋白酶

变速传动机构主要由什么组成？

数据管理技术发展阶段中，人工管理阶段与文件系统阶段的主要区别是文件系统

A．数据共享性强

B．数据可长期保存

C．采用一定的数据结构

D．数据独立性好

阅读理解。

     Your body, which has close relations with the food you eat,

is the most important thing you own, so it needs proper treatment

and proper nourishment (营养). The old saying"An apple a day

keeps the doctor away. "is not as silly as some people think. The

body needs fruits and vegetables because they contain vitamin C.

Many people take extra vitamins in pill form (丸剂) ,  believing

that these will make them healthy. But a good diet is made up of

nourishing food and this gives all the vitamins you need.  The body

doesn't need or use extra vitamins, so why waste money on them?

     In the modern western world, many people are too busy to

bother about eating properly. They throw away the good habits and

throw anything into their stomachs, eating hurriedly and

carelessly. The illnesses caused or made worse by bad, eating

habits are frightening.

1. From the first sentence we know that ____.   

A. the more you eat,the better you will feel

B. your body is made up of the food you eat

C. what you eat has great effect on your health

D. all kinds of food you eat can be made into your nourishment

2. How do you understand the old saying underlined in Paragraph 1? 

A. Doctors are no longer necessary if we eat an apple every day.

B. Eating apples regularly brings lots of benefits to our health.

C. The apple is the best among all kinds of fruits.

D. Eating apple is a good way to cure illnesses.

3. In modern western countries, ____.   

A. people are only too busy to cook meals for themselves

B. people don't want to pay more attention to their eating

C. people throw everything into their stomachs without digestion

D. lots of people's illnesses are caused or made worse by bad eating habits

4. If we want to keep healthy,we should _____ .   

A. eat properly

B. only eat an apple a day

C. take as many vitamin pills as possible

D. throw everything into our stomachs slowly and carefully

氯丙嗪能翻转肾上腺素的升压作用主要是因为阻断（）

A.M胆碱受体

B.中枢神经系统α受体

C.DA受体

D.外周血管α受体

E.以上都对

正常人离心尿沉渣中透明管型的参考范围（）

A.0～1个／LPF

B.1～3个／LPF

C.3～5个／LPF

D.5～10个／LPF

E.10～15个／LPF