问题 问答题 简答题

吸附时间的两种控制方式分别在哪些情况下应用?

答案

参考答案:

吸附时间是调整PSA操作中的重要因素,TMAUTOON和TMADJUSTON控制时,吸附时间随进料量变化及时自动调整,并在保证产品纯度条件下,使氢回收率保持在一个高水平上,因此,在正常生产中,该控制方式是优先选用的操作方式,而TMAUTOOFF和TMADJUSTOFF控制方式一般应用于开停工或者进料组成急剧变化或怀疑进料流量计、氢气纯度分析有故障等异常情况下操作员根据进料大小输入合适的吸附时间,以便尽快产品合格,防止杂质超载的发生。

完形填空

I think the most terrible(最糟糕的) thing in life for my little brother is getting up in the morning. He is always ___1___ when my mother calls, “John! It’s seven o’clock! ___2___ up!”

John ___3___, “I’m coming!” and goes right back to ___4___.

I’m not ___5___ my brother. I don’t like to go to bed ___6___ but I don’t mind getting up in the morning. I ___7___ wake up before my mother calls me.

But not John. He ___8___ sleeps. After calling a few more times my mother has to come upstairs(到楼上) and pull(拉)John out of ___9___. He always says, “I was going to get up in ___10___ minute. Really I was.”

(      ) 1. A. glad      B. surprised (惊讶) C. unhappy    D. happy

(     ) 2. A. Look     B. Get           C. Climb      D. Put

(      ) 3. A. answers    B. asks          C. wonders     D. means

(      ) 4. A. work     B. study         C. play       D. sleep

(      ) 5. A. as        B. like           C. different    D. same

(      ) 6. A. at night    B. at last         C. quick      D. slowly

(      ) 7. A. never     B. usually        C. sometimes   D. only

(      ) 8. A. just       B. alone         C. finally      D. really

(      ) 9. A. the door   B. the window    C. bed        D. the room

(      ) 10. A. another    B. other        C. the other    D. others

单项选择题