易燃液体应避热存放,灌装时应留有()的气空间。 A.5%以下 B.5%以上 C.3%

题型:单项选择题

问题:

易燃液体应避热存放,灌装时应留有()的气空间。

A.5%以下

B.5%以上

C.3%以下

D.3%以上

考点:裂解裂化工艺考试裂解裂化工艺考试题库
题型:单项选择题

新制的氯水呈淡黄绿色,说明氯水中有____________分子存在;向氯水中滴入几滴AgNO3溶液,立即生成白色沉淀,说明氯水中有_____________存在;蓝色石蕊试纸遇到氯水后,首先变红,但很快又褪色,这是因为__________;氯水经光照后,淡黄绿色逐渐消失,并放出无色的气体,该反应的化学方程式是__________。

题型:单项选择题

下列选项中,()是指业主为了帮助承包商解决施工前期开展工作时的资金短缺,从未来的工程款中提前支付的一笔款项。

A.暂定金额

B.保留金

C.预付款

D.总承包服务费

题型:单项选择题

阅读理解

     I suppose that having been brought up in the countryside and close  to animals,it wasn't remarkable

(不平常的)when I decided  to become a vet(兽医). Luckily I was also good at all the necessary science

subjects. So after the college entrance examination I found myself at a veterinary college,training to look

after animals in all kinds of situations. I hoped that I would be able to work in the research field so that I

could find cures for animal diseases.

      Much to my surprise,I found public health care was a very important aspect of my course. This is an

area of animal medicine where a vet's work has many things in common with the work of a doctor of

human diseases. I particularly liked it because I recognized that the study of animal diseases can help

human medicine. As we know,many infectious diseases come from animals-including SARS and bird flu.

Some of the infections have only been understood after carefully analytical work in labs by animal doctors. They helped identify the animal source for diseases such as SARS. They were also the first to identify

various kinds of viruses. Sometimes vets are also able to suggest a cure for human illnesses. When I found this out I was determined to make public health medicine my chosen career.

      After graduation,I applied for a job in public health. Soon I found myself concerned with the problem

of bird flu. This is  an illness that attacks birds,but humans can catch the disease  if they are in close

contact with infected birds. Though the job  is dangerous,it makes me proud that vets and other animal  

disease researchers are in the front line helping to fight these  unknown human diseases.

1. The writer wanted to become a vet mainly because______.

A. he did well in all necessary subjects

B. he wanted to help animals

C. he was close to animals in his early life

D. he wanted to find cures for human diseases

2. What made the writer particularly like the course of public health care was that________.

A. it was both important and interesting

B. it could help him connect many human diseases with animals

C. it made a vet's work very much like a doctor's

D. it could help human medicine by studying animal diseases

3. What can be followed if this passage continues?

A. The writer's happy family life.

B. How the writer did research work in studying bird flu.

C. How the writer dealt with the relationship with other workmates.

D. What difficulty the writer met in the research work.

4. Which of the following is implied in the passage?

A. Animals with infectious diseases should be killed.

B. Keeping animals is dangerous to humans.

C. Dangerous as a vet's job is,it is significant to the human race.

D. Animal researchers work in the same way as human doctors.

5. Which of the following statements is NOT true?

A. Being a vet is helpful to both animals and humans.

B. Vets can cure both animals and humans.

C. Vets helped identify animal resources for SARS.

D. Both SARS and bird flu are infectious diseases coming from animals.

题型:单项选择题

水泵铭牌上的效率为泵的( )。

A.设计效率
B.最高效率
C.经济效率
D.容积效率

题型:单项选择题

16世纪,在西欧流行这样一句话:“谁控制了(亚洲的)马六甲,谁就扼住了(意大利)威尼斯的咽喉。”下列与此直接相关的是()

A.文艺复兴

B.宗教改革

C.新航路开辟

D.工业革命

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