问题
问答题 简答题
如果在助燃空气中增加氧气含量，对生产有何影响？
答案
参考答案：燃烧产物量减小，提高火焰温度；燃烧速度快，火焰长度减小，增大熔窑温度差；耐火材料损坏速度加快，玻璃中出现耐火材料结石，熔窑寿命缩短。
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如果在助燃空气中增加氧气含量，对生产有何影响？
参考答案：燃烧产物量减小，提高火焰温度；燃烧速度快，火焰长度减小，增大熔窑温度差；耐火材料损坏速度加快，玻璃中出现耐火材料结石，熔窑寿命缩短。
| 阅读理解。 |
| Eileen Gorgers is my best friend. We're both from Chicago, but now I live in San Francisco and Eileen live in Atlanta. We don't see each other (互相) very often, but we are in touch all the time. I often write to Eileen and tell her about all the things that are happening (发生) at the Ajax Company. I'm the office manager there. And she often writes to me about her work at the Valley Hospital. She is a doctor there. We talk on the telephone once a week, either on Saturday or Sunday morning. There are also other ways we communicate with each other. Sometimes I call her on her car phone, or she faxes (传真) me on my fax machine (机器). And when I have something very important to tell her, I sometimes keep her on her beeper. We're really lucky (幸运). In this new age of communication, there are so many ways we can keep in touch with each other. We live in different cities on different coasts, but we're in touch all the time. |
| 1. Where are they from? They are from ______. |
[ ] |
| A. San Francisco B. Atlanta. C. Chicago D. Ajax |
| 2. What does Eileen do? She is ______. |
[ ] |
| A. a doctor B. a manager C. driver D. policewoman |
| 3. How do they sometimes keep in touch with each other? |
[ ] |
| A. On the telephone B. On the fax machine C. On the beeper D. A, B and C |
| 4. Why are they lucky? Because ______. |
[ ] |
| A. they live in different cities B. they are from Chicago C. they are friends D. there are so many ways to keep in touch. |
| 5. The underlined phrase "keep in touch" means( 意思是) . |
[ ] |
| A. 看见 B. 保持联系 C. 听见 D. 触摸 |