问题
单项选择题
分馏塔下部设脱过热段是因为分馏塔下部进料是460℃以上的高温油气，大大超过了在该分压下油气的（），因此入塔后要先冷却到饱和状态，才能进行分馏，因此下部设有八层人字挡板，用循环，油浆冷却，取走过剩热量，同时油气中含催化剂粉末，也要靠循环油浆把它冲洗下来，以免造成塔盘堵塞和影响产品质量。
A.露点
B.泡点
C.沸点
答案
参考答案：A
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分馏塔下部设脱过热段是因为分馏塔下部进料是460℃以上的高温油气，大大超过了在该分压下油气的（），因此入塔后要先冷却到饱和状态，才能进行分馏，因此下部设有八层人字挡板，用循环，油浆冷却，取走过剩热量，同时油气中含催化剂粉末，也要靠循环油浆把它冲洗下来，以免造成塔盘堵塞和影响产品质量。
A.露点
B.泡点
C.沸点
参考答案：A
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| Martin is an American boy. He's eight 1 old. One evening, Jimmy, one of his classmates, came to his home with an expensive book in his hand. "Could you help me 2 this maths problem?" Jimmy said as soon as he came into the room. "It's too hard for 3 ." "Let me 4 ," Martin said. "I hope it isn't hard for me." Martin tried his best but he couldn't work it out, either. " 5 we had a small computer, all the problems would be easy enough for us to do," Jimmy said. "A small computer…" Martin thought for a minute, and then he said, "I've got a(n) 6 . We can buy one in a shop!" "A computer is very 7 , and we don't have enough money." "That's OK," said Martin. "We can ask the new president (总统) for some money. He said he would help anyone in trouble. I 8 he will help us. He is very 9 , you know." So they 10 to write a letter to the new president. Soon they finished the letter and hurried to the 11 office. In front of the office stood a small box. They 12 the letter into the box 13 and went home happily. The next morning, they passed the post office on their way to school. They found, to their 14 , the box was not a post-box, 15 a trash can (垃圾箱). |
| ( )1. A. years ( )2. A. out ( )3. A. you ( )4. A. have ( )5. A. If ( )6. A. money ( )7. A. expensive ( )8. A. know ( )9. A. short ( )10. A. had ( )11. A. post ( )12. A. brought ( )13. A. well ( )14. A. happy ( )15. A. and | B. days B. to B. her B. try B. When B. one B. cheap B. understand B. fat B. took B. police B. dropped B. beautifully B. surprise B. or | C. months C. with C. me C. do C. Why C. shop C. big C. think C. poor C. learned C. bank C. took C. carefully C. sorry C. for | D. weeks D. by D. them D. make D. Since D. idea D. useful D. want D. kind D. decided D. teacher's D. moved D. slowly D. joy D. but |