邻二甲苯中间二甲苯、对二甲苯含量超标的原因是什么？如何处理？
参考答案：
原因：
（1）二甲苯塔底汽化率低，间、对二甲苯残留在塔底。
（2）二甲苯塔底液面低或波动大。
（3）二甲苯塔温差偏低或波动大。
（4）循环线串漏。
（5）仪表故障。
（6）分析误差。
处理：
（1）提高二甲苯塔底汽化率。
（2）提高二甲苯塔底液位并调节稳定。
（3）提高二甲苯塔温差并使之稳定。
（4）改循环或分罐应先关后开，避免串油。
（5）联系仪表修理。
（6）联系化验复查。
| 完形填空。 | |||
| In some parts of the world there are large deserts. There are no trees __1___ water there. Travelers must take __2___ and water with them. The only animal who can walk __3___ the desert is the camel. It can go __4___ food and water for a long time, and it can carry heavy loads (担子). People call the __5___"the ship of the desert". The camel is very big. It had one or two humps (驼峰) on its back, short ears and a long __6___. The camel's humps hold fat, and its stomach hold water in twelve deep pockets. Each pocket __7___ a closed mouth and the food does not move with the water. When thecamel ___8__ some water, it can get it out of the __9___. The camel's food is __10___. | |||
| ( ) 1. A. and no ( ) 2. A. grass ( ) 3. A. out of ( ) 4. A. with ( ) 5. A. horse ( ) 6. A. nose ( ) 7. A. has ( ) 8. A. is wanting ( ) 9. A. hands ( ) 10. A. meat | B. any B. food B. into B. to B. elephant B. leg B. thereis B. wanted B. pockets B. bread | C. and C. meat C. in C. without C. cow C. neck C. have C. was wanting C. mouth C. cakes | D. no D. drink D. through D. into D. camel D. mouth D. having D. wants D. nose D. grass and leaves of trees |