问题 问答题 简答题

正常出铁的操作与注意事项是什么?

答案

参考答案:

正常出铁的操作包括:按时开铁口,注意铁流速度的变化,及时控制流速;铁罐、渣罐的装入量应合理;出净渣、铁;堵好铁口等几个步骤。应注意的事项是:

(1)开铁口时钻杆要直;开孔要外大内小。当发现潮气时,应用燃烧器烤干后方可继续开钻;为了保护钻头,不应用钻头直接钻透。

(2)出铁过程中应随时观察铁水流速的变化,发现卡焦炭铁流变小时,应及时捅开;若铁口泥包断裂铁流加大,出现跑大流时,应用河沙等物加高铁沟两边,防止铁水溢流。

(3)防止渣、铁罐放得过满;推下渣时要注意铁口的渣、铁流量变化,防止下渣带铁。

(4)堵铁口前应将铁口处的积渣清除,以保证泥炮头与铁口泥套严密接触,防止跑泥;开泥炮要稳,不冲撞炉壳;压炮要紧、打泥要准,应根据铁口深度增减打泥量。因意外故障需在未见下渣或很少有下渣堵铁口时,要将泥炮头在主沟上烤干烤热后再堵,防止发生爆炸。

阅读理解

At a nation’s saddest moment, its greatest heroes are born.

  On September 11th, 2001, many police officers and government officials in America worked day and night to save lives from the big fire at the World Trade Centre. And in Japan, after the serious earthquake, a group of workers showed their courage.

  The earthquake on March 11th made Fukushima Nuclear Power Plant(福岛核电站) turn off and stop its protective cooling systems. And later, a fire broke out.  Workers were told that the plant’s radiation(辐射) could be harmful to human health. Hundreds of workers left the plant quickly. However, a group of workers decided to fight against the fire and the damage, though they knew it could cause very serious health problems. There were 50 workers in all, so they were also named the "Fukushima 50". The workers worked in shifts(轮班).

  People knew little about the workers, who were mainly experts (专家) with the skills to control the situation. One woman said that her father had volunteered to stay there. “I heard that he volunteered even though he would retire(退休) in just half a year and my eyes were filled with tears. I am really proud of him. And I pray for his safe return.”

小题1:The passage mainly tells us                           .

A.what happened in America on September 1lth, 2001

B."Fukushima 50" stayed in the nuclear power plant bravely

C.who saved many lives from the big fire at the World Trade Centre

D.what Japanese government did after the nuclear power plant was turned off小题2: Fukushima Nuclear Power Plant was turned off because              .

A.there were no heroes there

B.many workers left the plant

C.it was destroyed by a big fire

D.the earthquake damaged it heavily小题3:       workers stayed in Fukushima Nuclear Power Plant after the earthquake.

A.11

B.50

C.100

D.150小题4: Which of the following is TRUE?

A.The woman was happy to know his father was there.

B.A woman’s father who had retired from work still stayed there.

C.Little was known about the workers when the passage was written.

D.The workers didn’t know staying in the nuclear plant was harmful to their health.小题5: The writer thinks                          .

A.American police officers were very strong

B.the nuclear radiation would do no damage to humans

C.all the workers who stayed in the plant should return quickly

D.all the workers who stayed in the plant are great heroes

单项选择题