问题 问答题 简答题

LT09202液位计出现故障原因有哪些?出现故障时怎样操作?

答案

参考答案:

原因:

①接收器进水或损坏。

②γ射源接近半衰期或射源安装位置不准确。

③气体密度变化太大引起误指示。

④调校液位计时未加气体密度修正值。

⑤仪表及仪表电源故障。

处理:

①修理或烘干接收器

②更换射源或重新安装射源。

③保持工艺稳定,当工艺指标接近正常参数后会正常。

④调校液位计时加气体密度修正值。

⑤修理或更换仪表。

操作:

①LIC09202改手控操作。

②相同负荷下LIC09202输出信号在原阀位基础上增加2~5%。

③观察TR09210温度变化情况,若温度下降,则E101液位空,此时应保持阀位不变,让其略带有窜气为好。

④若PRC09207下降太多,PRC09305上升较快或调节阀开度增加较多,可适当关小LIC09202。⑤LIC09202改手控后,E101汽提有少量窜入进中压系统,C101负荷略有上升应适当调节。

阅读理解

阅读理解。

     As kids, my friends and I spent a lot of time out in the woods. "The woods" was our part-time address,

destination, purpose and excuse. If I went to a friend's house and found him not at home, his mother might

say, "Oh, he's out in the woods," with a tone (语气) of airy acceptance. It's similar to the tone people

sometimes use nowadays to tell me that someone I'm looking for is on the golf course or at the gym, or even

"away from his desk." For us ten-year-olds, "being out in the woods" was just an excuse to do whatever we

feel like for a while.

     We sometimes told ourselves that what we were doing in the woods was exploring (探索). Exploring was

a more popular idea back then than it is today. History seemed to be mostly about explorers. Our explorations,

though, seemed to have less system than the historic kind: something usually came up along the way. Say we

stayed in the woods, throwing rocks, shooting frogs, picking blackberries, digging in what we were briefly

persuaded was an Italian burial mound.

     Often we got "lost" and had to climb a tree to find out where we were. If you read a story in which

someone does that successfully, be skeptical: the topmost branches are usually too skinny to hold weight, and

we could never climb high enough to see anything except other trees. There were four or five trees that we

visited regularly-tall beeches, easy to climb and comfortable to sit in.

     It was in a tree, too, that our days of fooling around in the woods came to an end. By then some of us has

reached seventh grade and had begun the rough ride of adolescence (青春期). In March, the month when we

usually took to the woods again after winter, two friends and I set out to go exploring. We climbed a tree, and

all of a sudden it occurred to all three of us at the same time that were really rather big to be up in a tree. Soon

there would be the spring dances on Friday evenings in the high school cafeteria.

1. The author and his friends were often out in the woods to _____. [ ]

A. spend their free time

B. play golf and other sports

C. avoid doing their schoolwork

D. keep away from their parents

2. What can we infer from Paragraph 2? [ ]

A. The activities in the woods were well planned.

B. Human history is not the result of exploration.

C. Exploration should be a systematic activity.

D. The author explored in the woods aimlessly.

3. The underlined word "skeptical" in Paragraph 3 is closest in meaning to _____. [ ]

A. calm

B. doubtful

C. serious

D. optimistic

4. How does the author feel about his childhood? [ ]

A. Happy but short.

B. Lonely but memorable.

C. Boring and meaningless.

D. Long and unforgettable.

单项选择题