问题 问答题 简答题

简述罩式火中的脱氮工艺要点。

答案

参考答案:

罩式炉松卷退火时,可以同时进行脱氮处理,脱氮时,首先用含H24%(其余为N2)的气体保护退火,加热到700℃,将保护气体换成75%H2、25%N2并增湿,此时,钢带发生脱碳、脱氮反应,保护气体中的CO含量上升,当其含量再次下降时,停止增湿,并逐步换成初始时的保护气氛,冷却后,钢带即可出炉。通过此种方式处理,钢带含碳量可达到0.003%以下,含N2量可达到0.0001%以下。

阅读理解

阅读理解。正确的用A ,错误的用B。

    

     Look! The boy is playing basketball. Do you know the boy? His name is Rick Rubio. He likes

playing basketball. He almost plays basketball every day. Many people know him in the Beijing

Olympic Games. His fans think he is a basketball star, but he thinks he is just a student.  He was born

in Barcelona, Spain on October 21st, 1990.  He is l. 81 meters tall. He weighs 93 kg. He became the

youngest player to play in the Spanish ACB League at the age of 15. Now he is a basketball player in

Spanish National Basketball Team. Now everyone wants to talk about NBA players. Ricky Rubio

might be one of the best basketball players in the world.  "I'm Ricky Rubio," he said.  "I play basketball

because I like basketball. I don't think I'm like other players. "Now let's listen to his fans.

     Fan A: He is so young and skilled. And he is so cool all the time.

     Fan B: He knows what he's doing. He knows the game and he can become a great player.

     Fan C: I personally think he is going to be great.

     Fan D: I think he is a superman. I want to become such a famous basketball player, too.

( )1.Ricky Rubio took paft in the Beijing Olympic Games at the age of 18.

( )2.When he was 15 years old, Ricky Rubio joined the Spanish ACB League.

( )3. Ricky Rubio is one of the best basketball players in NBA now.

( )4. Ricky Rubio plays basketball because his father wants him to do it.

( )5.One of his fans wants to become a basketball player like him.

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