问题 问答题 简答题

何谓魏氏组织?出现魏氏组织后如何消除?

答案

参考答案:魏氏组织是沿着过饱和固溶体的特定晶面析出,并在母相内呈一定规律的片状或针状分布的第二相形成的复相组织,这样特征的组织称为魏氏组织

当出现魏氏组织后,可以通过退火或正火来消除,也可以来用二次淬火或先正火后进行一次(或二次)淬火来消除。

填空题
阅读理解

阅读理解。

    Mr King lived with six hundred wild animals on the Greek Island of Kyklos. Ever since he left school, he

had traveled all over the world collecting animals for his own zoo. He hoped to collect two examples of every

kind of animal on his island. But he was afraid that people would find him someday.

    He wrote books about his travels and about his animals that he collected. The money from the books helped

to pay for all the food that these animals ate. 

    One day, when Mr King was out looking for drinking water, her found oil. He needed money for his travels

and for his zoo, and a little oil would buy enough water for what he needed all his life, but he knew what if he

told anyone else about it, it would be the end if his zoo and his life's work. So he decided not to tell anyone else

about what he had found, because oil and water couldn't mix.

1. Mr King traveled all over the world for collecting _____. [ ]

A. oil

B. water

C. animals

D. money

2. Mr king was afraid that people would find him someday because _____. [ ]

A. he hadn't got enough money for them

B. that would be the end of his zoo

C. he hadn't got enough water and oil

D. they would buy his animals

3. Mr King wrote books to _____. [ ]

A. tell people about his story

B. tell people how to find oil

C. get enough money for his animals

D. make money for his travels

4. In the passage, "oil and water couldn't mix" means that "_____". [ ]

A. Mr King needed not only water but also oil

B. oil and water were rather difficult to be mixed together

C. Mr King's animals only needed water, not oil

D. if be told the others he found oil, his life's work would be stopped