问题 问答题 简答题

机组正常运行中如何校验备用差压阀能将油氢差压维持在0.056MPa?

答案

参考答案:

⑴检查高压备用密封油系统阀门状态正确,油源压力正常;

⑵为避免在空侧泵出口阀手动关小、主差压阀会自动关小的双重作用下,使油泵打闷泵,出口超压,应将主差压阀的空侧油、氢压信号隔离阀关闭;

⑶缓慢关小空侧油泵出口阀(并不是空侧交流油泵出口阀),注意监视油氢差压和空侧油泵出口油压,油氢差压降至0.056MPa,不再进一步下降,且高压备用油源压力下降,手摸高压备用油管路温度上升,说明备用差压阀整定值正常。继续缓慢关小直至关闭空侧油泵出口阀,检查空侧油泵声音正常,油泵出口压力一般不超过0.8MPa,最高不超过1.0MPa,油压高时手摸安全阀有无动作;

⑷油氢差压降至0.050MPa,有进一步下降趋势,且油源压力未见变化,高压备用油管路温度未上升,说明备用差压阀整定值不正常,应重新整定使油氢差压升至0.056MPa,继续缓慢关小直至关闭空侧油泵出口阀,检查油氢差压稳定;

⑸缓慢开启空侧油泵出口阀,开启主差压阀的空侧油、氢压信号隔离阀,检查油氢差压稳定上升至0.084MPa。

阅读理解

阅读理解。

     As any homemaker who has tried to keep order at the dinner table knows, there is far more to a family meal

than food. Sociologist Michael Lewis has been studying 50 families to find out just how much more.

     Lewis and his co-workers carried out their study by videotaping (录像) the families while they ate ordinary

meals in their own homes. They found that parents with small families talk actively with each other and their

children. But as the number of children gets larger, conversation gives way to the parents' efforts to control the

loud noise they make. That can have an important effect on the children. "In general the more question-asking

the parents do, the higher the children's IQ scores," Lewis says. "And the more children there are, the less

question-asking there is." The study also provides an explanation for why middle children often seem to have a

harder time in life than their siblings (兄弟姐妹). Lewis found that in families with three or four children, dinner conversation is likely to center on the oldest child, who has the most to talk about, and the youngest, who needs the most attention. "Middle children are invisible," says Lewis. "When you see someone get up from the table and walk around during dinner, chances are it's the middle child." There is, however, one thing that stops all

conversation and prevents anyone from having attention: "When the TV is on," Lewis says,"dinner is a

non-event."

1. The writer's purpose in writing the text is to ______.

A. show the relationship between parents and children

B. teach parents ways to keep order at the dinner table

C. report on the findings of a study

D. give information about family problems

2. Parents with large families ask fewer questions at dinner because _______.

A. they are busy serving food to their children

B. they are busy keeping order at the dinner table

C. they have to pay more attention to younger children

D. they are tired out having prepared food for the whole family

3. By saying "Middle children are invisible" in paragraph 3, Lewis means that middle children ______.

A. have to help their parents to serve dinner

B. get the least attention from the family

C. are often kept away from the dinner table

D. find it hard to keep up with other children

4. Lewis' research provides an answer to the question ______.

A. why TV is important in family life

B. why parents should keep good order

C. why children in small families seem to be quieter

D. why middle children seem to have more difficulties in life

5. Which of the following statements would the writer agree to?

A. It is important to have the right food for children.

B. It is a good idea to have the TV on during dinner.

C. Parents should talk to each of their children frequently.

D. Elder children should help the younger ones at dinner

问答题

有三位来自中国、日本和美国的老师教孩子画苹果。
中国老师走进教室说:“同学们,上一节美术课,我们学习了画水杯,这一节课我们学习画苹果。大家先观察我是怎样画的。注意,先画一个正方形,注意,这个正方形要画的轻一些,因为最后要擦掉……好了,老师画完了。现在请大家拿出美术本开始画,注意我是怎样画的。”——中国学生一次就画出了最像苹果的“苹果”。
日本老师手里拿着一个苹果走进教室:“同学们,这是什么……对,这是苹果,大家喜不喜欢如果喜欢,大家可以看一看,闻一闻,摸一摸……但这个苹果不能吃,因为只有一个,而且我们这一节课要学习画苹果。”然后,将苹果放在讲台上。“现在,大家可以画苹果了。”——苹果还在,学生有了观察的对象,第一次画得可能像梨,第二次画得就有些像苹果了。
美国老师提着一篮子苹果进教室:“同学们,这是什么……对,这是苹果。大家喜不喜欢如果喜欢,大家可以上来拿一个。”同学们各自拿了一个苹果,老师接着说:“大家可以看一看,闻一闻,摸一摸,玩一玩。这些苹果老师都洗干净了,如果喜欢,还可以把它吃掉。”一段时间过去,许多同学已经吃掉了苹果。这时,老师开始布置任务:“同学们,我们这一节课要画苹果,现在请大家在自己的本子上画上苹果。”——苹果已经吃掉了,学生第一次可能画得像南瓜,第二次可能像梨,第三次画得才有点像苹果。
结合本案例回答:三位分别来自中国、日本和美国的老师在上同一节画苹果的课上,他们的教育理念和教育方式存在着什么差异