油罐为什么会抽瘪？
参考答案：1.冬季由于罐内有水汽，使机械呼吸阀阀盘与阀座冻结失灵。
2.呼吸阀弹簧锈蚀失灵。
3.发油速度过快，超过呼吸阀口径允许的进气速度，使罐内出现负压，超过设计规定。
4.阻火器铜网或皱纹板脱落堵堵塞。
5.当进油温度过低、过快，使罐内气体空间温度迅速下降，大量油气凝结，超出呼吸阀能力，形成的负压超过油罐设计规定。
| 完形填空。 | ||||
| While getting ready for school today, my 16-year-old daughter came into my room to give me a big hug and kiss. I asked her, "What do you want?" She said," 1 Mum, you always tell us to have a good day 2 we leave the house, but I was 3 about who tells you to have a good day and lets you know how much you are 4 ." I am so 5 by the capacity of love and understanding that 6 my children. My 15-year-old son asked me last night if there was a(n) 7 for him to get a summer job this year in order to help us to pay our bills. 8 , in our area, he must be 16. 9 of my children depend on me so much because I am a 10 parent, but just when I pay the 11 that I will not be able to provide for them, they come up with ways to 12 . I completely understand that I will 13 have to find a way to pay the bills as I do not want my children to take up anything. But for now the 14 that they have stepped up and 15 to help without anyone asking touches me. When my daughter was two, I remember rushing to get to 16 , getting to the front door and asking her to 17 and come. Then she appeared at the door with a bag that she was holding open. I said,"We don't have 18 for this." She stopped me and said,"Fill it with love, Mum." I 19 to my knees and hugged her and then kissed her. From then 20 she would bring the bag and I would bring the love to the door before we left for school and work. | ||||
|