问题 问答题 简答题

水位计的平衡容器及汽、水连通管为什么要保温?

答案

参考答案:

保温的目的主要是为了防止平衡器及连通管受大气的冷却散热,使其间的水温下降,与汽包内的水相比产生较大的重度差,而这种重度差越大,水位计的指示与汽包内的真实水位误差越大,所以要在这些部位保温,以减小指示误差。

阅读理解

There was a park near my home. But I didn’t go there very often. Many people said there was nothing special. One afternoon I went into the park and found it was really small. I walked quickly because there wasn’t much to see. I walked for some time and found myself standing in front of two paths. 71  I found that the two paths were different from each other.

The left one was wide and clean. There were lots of flowers on both sides of the path. Though the flowers weren’t very beautiful, they made me feel good. I decided to take this path. But wait! I looked at the right one. The path didn’t look nice.  72  Grass grew everywhere. For a long time I couldn’t make up my mind.

  73  It wasn’t nice , but I didn’t want to give up. At last, I came to the end of the path. Ah! There was a small garden there. It was beautiful, perhaps the most beautiful garden I had ever seen.  74  

Many people told me that there was nothing much to see in the park. Now I’d like to tell them that if they had followed the right way, they would have felt differently. But when I told them about what I had seen in the park, they just smiled at me without saying a word. I knew they didn’t believe me. They couldn’t even remember that path because it was so small.

  75  Don’t be afraid to choose a different path. You may get a big surprise!

A.There is nothing that I want to see.

B.It looked like it had not been cleaned for months.

C.After a while a strange feeling made me follow the dirty path.

D.“ Which way should I go?” I asked myself. I looked at one way, then the other.E. I told them what happened.

F. My trip to the park that day made me understand something about life.

G. There were trees, flowers and chairs. I thought it was the nicest part of the park.

单项选择题 A1型题