问题
问答题 简答题
单级双吸离心泵有何特点？
答案
参考答案：
流量较大、扬程较高；安装维修方便；运转较平稳；但泵较笨重，机组占地面积大；适宜于固定使用。
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单级双吸离心泵有何特点？
参考答案：
流量较大、扬程较高；安装维修方便；运转较平稳；但泵较笨重，机组占地面积大；适宜于固定使用。
| 阅读理解。 |
| Early rising is helpful in more than one way. First, it helps us to have good health. We all need fresh air. It makes our health better to take morning exercises. The air is never so fresh as early in the morning. Early rising helps us in our studies. In the morning we learn more quickly and find it easy to learn something by heart. Early rising makes people able to plan the work for the day. We can't work well without a good plan. Just as the plan for the year should be made in the spring, the plan for a day should be made in the morning. Early rising gives us enough time to get ready for our work, such as to wash our hands and eat our breakfast. So the popular saying says, "Early to bed and early to rise makes a man healthy, wealthy (富有的) and wise." |
| 1. What does "early rising" mean? It means _____ early in the morning. |
[ ] |
| A. waking up B. getting up C. having breakfast D. making a day's plan |
| 2. Why does the passage advise us to take exercises early in the morning? |
[ ] |
| A. Because we can save much time. B. Because we are not busy in the morning. C. Because air in the morning is very fresh. D. Because we don't need to prepare for breakfast. |
| 3. We can work well with _____. |
[ ] |
| A. enough time B. a good reading C. clean hands D. a good plan |