问题 问答题

某城市排水工程的管道顶进采用普通顶管法施工,在施工过程中的部分工作方法和施工工艺如下。
(1)工作坑的支撑采用封闭式框架。
(2)采用手掘式顶管时,将地下水位降至管底以下0.3m时开始顶管。
(3)管顶以上超挖稳定土时不得在135°范围内。
(4)排水管道交叉时,排水圆管在上,铸铁管在下。
(5)施工中发现管道一侧少挖土12mm,而另一侧多挖土12mm,采用木杠支撑法进行纠偏。该城市排水工程的某混凝土构筑物施工完成后,进行满水试验,结果发现该混凝土构筑物存在裂缝,为了防止混凝土构筑物产生裂缝,对后期的施工提出控制措施。

问题


混凝土构筑物满水试验的要点有哪几项

答案

参考答案:混凝土构筑物满水试验的要点主要有注水、外观观测、水位观测和蒸发量的测定。

多项选择题
单项选择题

Of all the areas of learning the most important is the development of attitudes.. emotional reactions as well as logical thought processes affect the behavior of most people. "The burnt child fears the fire" is one instance; another is the rise of despots like Hitler. Both these examples also point up the fact that attitudes come from experience. In the one case the experience was direct and impressive; in the other it was indirect and cumulative. The Nazis were influenced largely by the speeches they heard and the books they read.

The classroom teacher in the elementary school is in a strategic position to influence attitudes. This is true partly because children acquire attitudes from those adults whose words are highly regarded by them.

Another reason it is true is that pupils often devote their time to a subject in school that has only been touched upon at home or has possibly never occurred to them before. To a child who had previously acquired little knowledge of Mexico his teacher’s method of handling such a unit would greatly affect his attitude toward Mexicans.

The media through which the teacher can develop wholesome attitudes are innumerable. Social studies (with special reference to races, creeds and nationalities), science matters of health and safety, the very atmosphere of the classroom... these are a few of the fertile fields for the inculcation of proper emotional reactions.

However, when children go to school with undesirable attitudes, it is unwise for the teacher to attempt to change their feelings by cajoling or scolding them. She can achieve the proper effect by helping them obtain constructive experiences.

To illustrate, first-grade pupils afraid of policemen will probably alter their attitudes after a classroom chat with the neighborhood officer in which he explains how he protects them. In the same way, a class of older children can develop attitudes through discussion, research, outside reading and all-day trips.

Finally, a teacher must constantly evaluate her own attitudes, because her influence can be negative if she has personal prejudices. This is especially true in respect to controversial issues and questions on which children should be encouraged to reach their own decision as a result of objective analysis of all the facts.

Which of the following best describes the organization of the first paragraph of the text()

A. An assertion is made and two examples are given to illustrate it

B. A controversy is stated and two opposite points of view are presented

C. A widely accepted definition is presented and two men are described

D. An idea is stated and two results of recent research are summarized