放磁组合仪的电子线路中,射极跟随器的作用是()。A、压制干扰 B、对脉冲信号进行功率

题型:单项选择题

问题:

放磁组合仪的电子线路中,射极跟随器的作用是()。

A、压制干扰

B、对脉冲信号进行功率放大

C、改善闪烁探测器与放大电路的匹配

D、提供高压

考点:射孔取心工考试射孔取心工(高级技师)射孔取心工(高级技师)题库
题型:单项选择题

阅读理解。

     When Siva Kalyan was born, his backbone was deformed(畸形的)resulting in a lifelong

difficulty in walking. But that hasn't stopped the nine-year-old from becoming a prodigy(天才).

     Until he was three-and-a-half years old, Siva could not even crawl. Wanting the best treatment

for their son, Siva's parents moved with him from India to Australia and later to the USA.

In the USA, his parents enrolled(使入学)him in the second grade based on his age. But his teachers

soon realized they had a genius. Siva was then tested for the eighth grade, but it was soon found

out that he was actually qualified for college courses. As one advanced course was not enough,

the brilliant boy is now taking two courses from Stanford University. Due to the treatment he received,

Siva's physical condition has improved as well.

     But none of this "just happened". It was his parents' understanding and correct guidance, and

the loving care of his grandparents that contributed to the growth of the genius. Siva's highly educated

and hardworking family has brought him up on the basis of certain principles.

The family believes that once a strong foundation is built for the child in English and mathematics, the

child is equipped to master any other subject, law, history, or engineering. It is equally important to

recognize the strengths of a child rather than forcing the child to do things that he may not want to do.

     Siva's parents helped. Siva focus his energies on his strength, which is mathematics. At the same

time they took care to see that he had friends to play with and enjoyed a few recreational activities.

The only activity that's restricted for Siva is viewing television. Siva watches TV only for 30 minutes

a day and video games are a bonus for special occasions.

     Thanks to his mother who is a singer, Siva has also learned music and even won the first and

second prize at two competitions. In sports, he likes to swim. He began to learn swimming to

strengthen his muscles, and by the age of eight he was able to swim a kilometer in both the backstroke

and the freestyle.

1. Why did Siva's parents move to the USA?

A. They wanted to give their son the best education.

B. They wanted their son to receive the best treatment.

C. They weren't used to life in India or Australia.

D. They wanted their son to go to Stanford University.

2. The underlined word "this" in the fourth paragraph refers to the fact that              .

A. Siva's parents enrolled him in the second grade

B. Siva's physical condition improved

C. Siva was tested for the eighth grade

D. Siva became a genius despite his disability

3. The family believes that              .

A. English and mathematics are easier to learn than other subjects

B. it is important to recognize the strengths of a child

C. a child must learn English rather than law or history

D. forcing a child to do things is also quite important

4. What can we learn about Siva?

A. He is really good at mathematics.

B. He has no friends to play with.

C. He is not allowed to play video games.

D. He learned swimming from his mother.

5. The text is mainly about             

A. the growth of a disabled child prodigy    

B. certain principles to bring up a child

C. the special ways to train a genius        

D. the influence of parents on their child

题型:单项选择题

1998年1~3月,上海市发生甲肝流行,后经调查证明是人们生吃受甲肝病毒污染的毛蚶。那么下列不属于此次甲肝流行特征的是()

A.病人有进食某共同食物的病史,不食者不发病

B.如果食物属一次性大量污染,用餐者中可产生暴发,并且病人临床经过往往较重

C.停供该食物后,流行即可平息

D.甲肝在1~3月多发

E.无职业、性别差别

题型:单项选择题

在规划环境影响评价的各项原则中,( )是其精髓。

A.科学、客观、公正原则

B.早期介入原则

C.公众参与原则

D.可操作性原则

题型:单项选择题

机要通信的工作质量也可以说是整个机要通信部门的()。

A、经营管理质量

B、素质、能力质量

C、规范服务质量

D、职业道德水平

题型:单项选择题

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