问题 单项选择题

关于给排水工程中圆井砌筑,下列表述错误的是()

A.砌块应垂直砌筑,上下砌块应错缝砌筑

B.圆井砌筑时应同时安装踏步

C.砌块逐层砌筑收口时,偏心收口的每层收进不应大于30mm

D.内外井壁应采用水泥砂浆勾缝

答案

参考答案:C

解析:

给排水工程中圆井砌筑的相关规定:

(1)排水管道检查井内的流槽,宜与井壁同时进行砌筑。

(2)砌块应垂直砌筑;收口砌筑时,应按设计要求的位置设置钢筋混凝土梁;圆井采用砌块逐层砌筑收口时,四面收口的每层收进不应大于30mm,偏心收口的每层收进不应大于50mm。

(3)砌块砌筑时,铺浆应饱满,灰浆与砌块四周粘结紧密、不得漏浆,上下砌块应错缝砌筑。

(4)砌筑时应同时安装踏步,踏步安装后在砌筑砂浆未达到规定抗压强度等级前不得踩踏。

(5)内外井壁应采用水泥砂浆勾缝;有抹面要求时,抹面应分层压实。

阅读理解

阅读理解。

                                  Will it matter (要紧) if you don't eat your breakfast?

     A test was given in America. People of different ages, from 12 to 33, were asked to have the test.

These people were given all kinds of breakfast, and sometimes they had no breakfast at all. Scientists

wanted to see how their bodies worked when they had eaten different kinds of breakfast.

     The rest shows that if a person eats a healthy breakfast, he will work better, If a student has fruit,

eggs, bread and milk for breakfast before going to school, he will learn more quickly and listen more

care-fully in class.

     The result also shows having no breakfast will not help you lose weight. This is because people

become so hungry at noon that they eat too much for lunch.  They will gain weight instead of losing it.

You will probably lose more weight if you reduce your other meals.

1. People of different ages _______ were asked to have the test.

A. from 12 to 20

B. from 20 to 30

C. from 12 to 33

D. from 20 to 33

2. Scientists in America did the research in order_______.

A. to know the relationship(关系)between breakfast and work or study

B. to see having breakfast is good

C. to understand how to keep healthy

D. to show a good way to lose weight

3. If you are a student, having breakfast before going to school will_______.

A. help you lose weight

B. help you learn more quickly and listen more carefully

C. help you work better

Dhelp you sleep well

4. What do "other meals" refer to(指代)?

A. Breakfast.

B. Lunch.

C. Breakfast and Lunch.

D.Lunch and Dinner.

5. What's the best title for the passage?

A. Losing Weight

B. The Importance of Breakfast

C. Work and Breakfast

D. Other Meals

解答题