把12：4=18：6改写成分数形式是：()()=()()．

在编制资格预审文件时，下列关于资格审查办法说法不正确的是( )。

A．资格审查办法包括合格制与有限数量制

B．采用合格制一般有利于降低招标投标活动的社会综合成本

C．采用有限数量制在一定程度上可能限制了潜在投标人的范围

D．审查标准包括初步审查和详细审查的标准

     Even a child knows that nodding the head means "Yes". But some people will probably be puzzled

when they first come to India. When they talk to an Indian, he often shakes his head. They might think

that the Indian does not like what he said, but on the contrary he is expressing agreement.

     The Indians have a habit of shaking their heads slightly when they talk to somebody. It doesn't mean

"No", but "Yes".

     If a person doesn't know this, it might cause misunderstanding.

     At one time a foreigner in Indian told his driver who was an Indian to take him to his office. The driver

shook his head. The foreigner repeated his request and the driver shook his head again. At last, the

foreigner shouted angrily, "Drive me to my office at once!" The driver said in a low voice, "Yes, sir,"

smiling and shaking his head again at the same time.           

1. Generally speaking, nodding the head means _______, and shaking the head means _______.

A. Yes; No      

B. No; Yes      

C. Yes; Yes      

D. No; No

2. Why did the Indian driver shake his head when the foreigner asked him to drive him to his office?

Because _________.

A. the Indian driver had something important to do

B. the foreigner promised to give him only a little money

C. the driver felt uncomfortable at that time

D. in India shaking the head means agreement

3. Why did the foreigner become angry? Because _______.

A. the Indian driver didn't want to send him to his office

B. he misunderstood the meaning of shaking the head in India

C. he asked the driver to send him to his office, but the Indian driver didn't say any words

D. the Indian driver asked him for a lot of money

4. The underlined phrase "on the contrary" means ________.

A. just the opposite        

B. clear difference between two things

C. doing what you want to do

D. on the other hand

关于蛋白质两性电离，正确的有（）

A.在不同PH溶液中，蛋白质分子所带电荷不同

B.在酸性溶液中蛋白质带正电荷，在电场中向阴极移动

C.在碱性溶液中蛋白质带正电荷，在电场中向阳极移动

D.在中性溶液中蛋白质电中性，在电场中无电泳位移，位于原点

E.等电点时蛋白质溶解性最小且易发生沉淀

静注普萘洛尔后再静注下列哪一种药物可表现升压效应

A．肾上腺素

B．异丙肾上腺素

C．东莨菪碱

D．氯丙嗪

E．新斯的明

岗位管理