试题与答案

纯碱是一种重要的化工原料。目前制碱工业主要有“氨碱法”和“联合制 碱法”两种工艺

题型:填空题

题目:

纯碱是一种重要的化工原料。目前制碱工业主要有“氨碱法”和“联合制 碱法”两种工艺。请按要求回答问题:

 (1)“氨碱法”产生大量CaCl2废弃物,请写出该工艺中产生CaCl2的化学方程式:_______________________________________________________;

(2)写出“联合制碱法”有关反应的化学方程式:____________________________________________;

(3) CO2是制碱工业的重要原料,“联合制碱法”与“氨碱法”中CO2的来源有何不同?__________________________________________________________;

(4)绿色化学的重要原则之一是提高反应的原子利用率。根据“联合制碱法”总反应,列出计算原子利用率的表达式:

原子利用率(%) =________________________________。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:错解析: 第一工序完工率=(20×60%)/80=15%;第一工序约当产量=30×15%=4.5(件) 第二工序完工率=(20+60×40%)/80=55%;第二工序约当产量=50×55%=27.5(件) 在产品的约当产量=4.5+27.5=32(件)

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Mr. and Mrs. Brown lived in a small town near London with their child. Sometimes Mr. Brown came back home from work very late, when his wife and the child were asleep, and then he opened the front door of this house with his key and came in very quiet.

But one night when he was coming home very late, he lost his key, so when he reached his house, he rang the bell. Nothing happened. He rang it again. Again nothing happened. Nobody moved inside the house. Mr. Brown knocked at the bedroom window, he spoke to his wife, he shouted, but she didn’t wake up. At last he stopped and thought for a moment. Then he began to speak like a small child.“Mother! ’’ he said.“I want to go to the toilet!’’ He spoke quite quietly, but at once Mrs. Brown woke up. Then he spoke to her, and she opened the door for him.

根据短文内容,判断下列各句正误。正确的在题前括号内写“T”,错误的写“F”。

小题1:The Browns lived in a small town near London.

小题2:Mr. Brown’s wife and his child went to sleep after he came back from work.

小题3:One night Mr. Brown lost his key to the door, so he knocked at the front door and the bedroom window.

小题4:Mr. Brown said“Mother” like a small child because he wanted his wife to wake up.

小题5:Mrs. Brown woke up at once when she heard the bell rang. She opened the door for her husband. 

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题型:单项选择题 案例分析题

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E.隐球菌性脑膜脑炎

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题型:问答题 简答题

计算简答题:

根据所给材料回答问题。(需计算后回答的问题须列出算式,小数保留2位。)

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