通过烃类热裂解能获得哪些产品？裂解工艺有哪几种？_爱下问搜题

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问题问答题简答题

通过烃类热裂解能获得哪些产品？裂解工艺有哪几种？

答案

参考答案：

烃类热裂解是生产低级烯烃（乙烯丙烯丁二烯等）的主要方法，氧化裂化是甲烷制备乙炔的主要方法；加氢裂化是由重质油制备轻质燃料油以及煤制造人造天然气的方法；有机酸酯裂解生成酸，酮和醇，由酯类加氨裂化制备腈；有卤烷热裂解制备卤代烷烃。

裂解工艺有三种：

1.由天然气生产烯烃；

2.由炼厂气生产烯烃；

3.由液态烃生产烯烃。

单项选择题 B型题

Crohn病排便次数增加（）

A.解痉剂

B.糖皮质激素

C.思密达

D.柳氮磺胺吡啶栓

E.强痛定

完形填空

People often fall ill because of me. 36 , they can hardly blame me; it is largely their own 37 .A tired person may get 38 , especially when he goes to crowded places with polluted air. A sudden change in 39 is another factor. In hot summer, people turn on the air-conditioner upon returning home. They will catch a cold easily.
My latest victim is an energetic student. After school, he played football hard for two hours. Though 40 , he still went to the cinema .Then he got back home and took a cold shower immediately.
I seized this golden chance to 41 him .He reacted ,trying to 42 me , but I was already 43 deep in his throat. He kept sneezing（打喷嚏） and his nose was running. 44 he put on some warm clothes, it didn’t work, for there were too many of us. Besides, his sore throat kept 45 him, and he developed a cough to force me and my family out, but 46 .
The next day he couldn’t go to 47 . He had lost his appetite and was not as 48 as before. His mother made him orange juice every few hours for more vitamin C, which would help his 49
For two days he was 50 by his mother. As he rested more, his defense strengthened and I began to feel the 51 . I knew I had to 52 him before long. But I am not the one who gives up easily, and I made every effort to fight back. 53 , it was my turn to feel 54 now, for his defense system was starting an all-out attack against me. I became 55 and finally my time was over.
Do you know what I am?

B．responsibility

A．temperature

A．get on with

C．put up with

D．take hold of

A．reproducing

D．disappearing

D．influencing

B．development

A．Uncertainly

B．Unsuccessfully

D．Unfortunately

B．disappointed