问题 问答题 简答题

高炉下部悬料产生的原因是什么?

答案

参考答案:

高炉下部悬料产生的原因有两个方面:

1.是由于热制度的波动引起软熔带位臵的变化,已经软化的矿料再次凝固,使散料层空隙度急剧下降,从而使Δp/H上升而悬料;

2.是液泛现象,液态渣铁或由于数量过多,或由于粘度过大,被气流滞留在焦炭层中,极大地增加了对气流的阻力。

单项选择题
阅读理解

Let children learn to judge their own work. A child learning to talk does not learn by being corrected all the time; if corrected too much, he will stop talking. He notices a thousand times a day the difference between the language he uses and the language those around him use. Bit by bit, he makes the necessary changes to make his language like other people’s. In the same way, children learn to do all the other things without being taught to walk, run, climb, whistle, ride a bicycle…They compare their own performances with those of more skilled people, and slowly make the needed changes. But in school we never give a child a chance to find out his mistakes and correct them for himself. We do it all for him. We act as if we thought that he would never notice a mistake. If it is a matter in mathematics or science, give him the answer book. Let him correct his own papers. Why should we teachers waste time in such routine(日常的) work? Our job should be to help the child when he tells us that he can’t find the way to get the right answer. Let the children learn what all educated persons must some day learn, how to measure their own understanding, how to know what he does not know.

小题1:According to the passage, the best way for children to learn things is by_____.

A.listening to skilled people’s advice.

B.asking older people many questions

C.making mistakes and having them corrected

D.doing what other people do小题2:Which of the following does the writer think teachers should NOT do?.

A.Give children correct answers

B.Allow children to mark mistakes.

C.Point out children’s mistakes to them.

D.Let children mark their own work小题3:According to the writer, teachers in school should _____

A.allow children to learn from each other

B.point out children’s mistakes whenever found

C.correct children’s mistakes as soon as possible

D.give children more book knowledge小题4:The passage suggests that learning to speak and learning to ride a bicycle are____

A.different from learning other skills

B.the same as learning skills

C.more important than other skills

D.not really important skills小题5:The title of this passage could probably be_____

A.Let Us Teachers Stop Work

B.Let Us Make Children Learn

C.Let Children Correct Their Exercises

D.Let Children Learn by Themselves