乙苯催化脱氢生产苯乙烯的过程,一般采用的反应器为()。
A、绝热床
B、等压床
C、流化床
D、等温床
参考答案:A, D
材料:鲁迅先生就中国的四大发明与应用有一段精辟的论述:“外国用火药制造子弹御敌,中国却用它做爆竹敬神;外国用罗盘针航海,中国却用它看风水;外国用鸦片医病,中国却拿来当饭吃。”(6分)
(1)中国古代的“四大发明”,除了材料中说到的两大发明之外,你知道还有哪两项吗?试着列举出来。哪两个人在你要列举的发明中起到了很大的推动作用?(4分)
发明三: 人物:
发明四: 人物:
(2)鲁迅先生这段话说明了什么问题?(2分)
用所给单词的适当形式填空。
1. He _____(read) newspaper in the garden when the earthquake happened.
2. There _____(be) a football match this evening. So I must finish my homework now.
3. The weather will become _____(bad) on Friday than before.
4. He is _____(terrible) ill. He must stay in bed.
5. Could you give me some good _____(advice) on how to learn Physics well?
6. Mike, like the other boys in his class,_____(enjoy) dancing.
7. Look, here _____(come) the bus.
8. I think they _____(fly) to Paris in two days.
9. He doesn’t know what _____(do) with the naughty boys.
10. It is eight o’clock in the evening. Mr Green _____(watch )TV.