问题
问答题 简答题
什么是循环流速和循环倍率？
答案
参考答案：
（1）一般规定上升管入口处的水流速度称为循环流速；
（2）进入上升管的循环水量与上升管的蒸发量之比称为锅炉的循环倍率。
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什么是循环流速和循环倍率？
参考答案：
（1）一般规定上升管入口处的水流速度称为循环流速；
（2）进入上升管的循环水量与上升管的蒸发量之比称为锅炉的循环倍率。
| 阅读理解。 |
| It is easier to go downhill than to climb uphill, so it is easier to fall into bad habits than into good ones. Bad habits don't come suddenly. They come little by little without your knowing their danger. Schoolboys first pick up little bad habits from schoolmates. If they see bigger boys smoking, they also want to learn to smoke. If they see their friends gambling (赌博), they want to gamble. When they get older, the habits become stronger and stronger so that they can no longer get rid of them. From copying, they learn to steal. From gambling, they learn to cheat. At last, they become distrusted (不信任) by everybody. How necessary (需要) it is that we get rid of the bad habits in the beginning! |
| 1. It is easier to fall into ______ than into . |
[ ] |
| A．good habits; bad ones B．bad habits; good one C．bad habits; good ones D．good habits; bad one |
| 2. Bad habits come . |
[ ] |
| A．suddenly B．little by little C．faster and faster D．easier and easier |
| 3. Where do schoolboys pick up little bad habits first? |
[ ] |
| A．In school B．On the street C．From older boys D．In school and on the street |
| 4. When schoolboys get older, their bad habits become . |
[ ] |
| A．stronger and stronger B．weaker and weaker C．better and better D．worse and worse |
| 5. It is important for us to . |
[ ] |
| A．copy others B．learn to steal and cheat C．become distrusted by everybody D．get rid of the bad habits in the beginning |