搜题请搜索小程序“爱下问搜题”
问题 问答题 论述题

抽油泵的一般要求是什么？

答案

参考答案：

（1）结构简单，强度高，质量好。连接部分密封可靠；

（2）制造材料耐磨，抗腐蚀性好，使用寿命长；

（3）规格能满足排量要求，适应性强；

（4）便于起下。

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 examples also point up the fact that attitudes stem from experience. In one case the experience was direct and impressive; in the other it was indirect and cumulative. The Nazis were indoctrinated 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 word they respect.
Another reason it is true is that pupils often delve somewhat deeply into 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 come 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 deleterious 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 decisions as a result of objective analysis of all the facts.

The passage specifically states that ______.

A．direct experiences are more valuable than indirect ones

B．whatever attitudes a child learns in school have already been introduced at home

C．teachers should always conceal their own attitudes

D．teachers can sometimes have an unwholesome influence on children
查看答案
单项选择题

信息技术的日益成熟和普及为实现教育的第几次飞跃提供了平台？（）

A.一

B.二

C.三

D.四
查看答案