氢氧化钠俗称______、______、______；物理性质有______、__爱下问搜题

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问题填空题

氢氧化钠俗称______、______、______；物理性质有______、______、______、______用途______；

氢氧化钠不能干燥的气体有______、______、______．（联想：浓硫酸不能干燥的气体有______．你认为我们了解的物质中还能做干燥剂的有______．）

答案

氢氧化钠俗名：火碱、烧碱或苛性钠；物理性质：NaOH是白色固体，易溶于水，溶解时放出大量热，易潮解；用途：重要的化工原料；用于石油精炼、造纸等工业，生活中可用于除去油污；因为氢氧化钠属于碱，能和酸性物质反应，故不能干燥酸性物质的气体，例如二氧化碳、二氧化硫、五氧化二氮等．同样硫酸属于酸，不能干燥碱性气体，例如氨气；还能做干燥剂的物质有氧化钙．

故答案为：火碱、烧碱、苛性钠；白色固体、易溶于水、溶解时放出大量热、易潮解；重要的化工原料、石油精炼、造纸；二氧化碳、二氧化硫、五氧化二氮；氨气；氧化钙．

完形填空

I really love my job because I enjoy working with small children and like the challenges and awards from the job. I also think my work is important. There was a time when I thought I would never have that sort of   36  .
I wasn’t an excellent student because I didn’t do much schoolwork. In my final term I started thinking   37  I might do and found I didn’t have much to 38  . I just accepted that I wasn’t the type to have a career. I then found myself a job, looking after two little girls. It wasn’t too bad at first, but the 39 began when I agreed to   40 , so that I would be there if my 41 had to go out for business in the evening. We 42  that if I had to work extra hours one week, she’d give me off the next. But 43  , it didn’t often work out. I was getting extremely   44and fed up, because I had too many 45  nights and early mornings with the children.
  46   Sunday, I was in the park with the children, and met Megan who used to go to school with me. I told her about my 47  . She suggested that I should take a (n)   48  and get a qualification if I wanted to work with children. I did not think I would be   49 because I didn’t take many exams in school. She    50 me to phone the local college and they were really helpful. My experience 51  for a lot and I got a part-time course. I had to   52  my job with the family, and got work helping out at a kindergarten. Now I’ve got a full-time job there, I shall always be   53 to Megan. I wish I had known   54  that you could have a career,   55  you aren’t top of the class at school.

A．particularly

C．unfortunately

D．disappointed

问答题简答题

折棚面与钩舌外侧面的技术要求？