如图18-2-27所示电路中,DA、DB是理想二极管,当UA=12V,UB=0时,输

题型:单项选择题

问题:

如图18-2-27所示电路中,DA、DB是理想二极管,当UA=12V,UB=0时,输出端的电位VY等于()。

A.12V

B.14V

C.0

D.10V

考点:注册土木工程师岩土工程基础知识注册岩土工程师基础考试上午试题
题型:单项选择题
连续掷一枚硬币,结果连续5次正面向上,那么第6次出现正面向上的概率为(  )
A.0B.1C.
1
2
D.
1
6
题型:单项选择题

词形变换。

1. In the past, most of people here__________(ride) bikes to work.

2. Today, Tom________(have) a lot of work to do. He________just________

(have) his breakfast and he________(leave) for school.

3. You needn’t________(worry) too much about your son. He_________

(be) well soon.

4. ________you________(put) away my book? I can’t find it anywhere.

5. The Green family________(live) here for ten years. They_________

(come)here in 1998.

6. Why not see the film with me? I_________(see) the film. I_________(see)

it last week with my sister.

7. What ________you________(do) with those old books yesterday? I _______(give) them to others.

8. I ________(watch) TV while Mary________(read) newspaper between

8:00 to 10:00 yesterday evening.

9. My brother ________(be) born in 1983. since then, he________(live)

in this city.

10. The TV play________(be) on for 2 hours.

题型:单项选择题

名字服务器系统一次性完成全部名字-地址变换的是

A.单次解析

B.多次解析

C.递归解析

D.反复解析

题型:单项选择题

阅读理解

     Customs are social habits. They have been handed down through generations  among groups, social

classes, etc. Customs can be described as ways of doing things. They are particularly strong in social

practices on the occasions  of births, marriages and deaths.

     In China, these days, some people in cities are learning from Western customs. For example, some

brides dress in the long white dress that is usual bridal wear in many Western countries.

     Every people has special customs for New Year. The Han people have many interesting Spring

Festival customs. And now, quite a number of people living in the cities have followed the Western

customs of sending New Year greeting cards for January 1st.

     One interesting custom in China is that mothers wrap up their babies tightly.This is not the custom in

Western countries, where babies are usually dressed in loose garments.

1. Which of the following statement is right?

A. Customs have been formed during a short time

B. Customs have been formed little by little

C. Customs have been quickly formed and changed

D. Customs have never been changed

2. In this passage, the word "people" is      .

A. 人们      

B. 人类      

C. 民族      

D. 大家

3. How do the Chinese young people learn from Western countries at their marriages?

A. The brides(新娘)have on the white clothes.

B. Men wear the white coats.

C. Their parents all have attended their marriages.

D. Their marriages are only held in Church.

4. From this passage we know      .

A. the people all over China spend New Year in the same way

B. people in the villages and cities send New Year greeting ny e-mail each other

C. each people has his special custom for New Year

D. most of Chinese people like to spend Spring Festival.

5. The difference about clothing between Chinese and Western babies is that      .

A. Chinese babies are usually dressed in new clothes

B. Western mothers are used to dressing their babies in colourful clothes

C. Western babies are dressed in bigger clothes while Chinese babies are usually wrapped

D. Chinese babies have more clothes than Western babies

题型:单项选择题

清洁生产是指食品行业的企业必须注意生产环节的卫生清洁工作,以保证为顾客提供安全卫生的食品。

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