问题 多项选择题

实施阻火分隔的技术特性,应符合下列规定中的( )。

A.阻火墙、阻火隔层和封堵的构成方式,均应满足按等效工程条件下标准试验的耐火极限时间不高于1h

B.除通向主控室、厂区围墙或长距离隧道中按通风区段分隔的阻火墙部位应设防火门外,其他情况下,有防止窜燃措施时可不设防火门。

C.阻火墙的构成,宜采用阻火包、矿棉块等软质材料或防火堵料、耐火隔板等便于增添或更换电缆时不至损伤其他电缆的方式,且在可能经受积水浸泡或鼠害作用下具有稳固性

D.阻火封堵、阻火隔层的设置,可采用防火墙料、填料或阻火包、耐火隔板等;在楼板竖井孔处,应能承受巡视人员的荷载

答案

参考答案:B,C,D

解析:[知识点] 电缆的防火与阻燃措施

多项选择题
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阅读理解

George Stephenson was born in 1781 in a poor family. He had to start work when he was only eight. When George was fourteen, he became his father’s helper. He spent a lot of time learning about engines. And on holidays he often took one to pieces and studied each piece carefully. Soon he became a very good worker though he could not read or write. He began to learn the English letters when he was seventeen years old. Every day after he did twelve hours of hard work, he walked a long way to have lessons from a young school teacher. On his eighteenth birthday, he wrote his own name for the first time in his life. George invented many things in his life. The train was the greatest one among them. Today when we watch or take trains from one place to another, we will think of this great man -- George Stephenson.

小题1: In which year did George Stephenson start to help his father?

A.In 1781.

B.In 1789.

C.In 1795.

D.In 1798.小题2: He learned about the engine ______.

A.through reading and writing

B.by taking it to pieces and studying each piece carefully

C.at lessons from a young teacher

D.by asking a lot of questions小题3: He spent a lot of time learning about engines and soon became ______.

A.a great man

B.a good maker

C.a good worker

D.a good student小题4: George Stephenson ______ in his childhood.

A.didn’t go to school

B.had lessons from a very good teacher

C.lived an easy life

D.invented the train小题5: The passage tells us ______.

A.everybody should work hard for a living

B.one can start studying at school at the age of 18

C.George Stephenson liked working very much

D.hard work leads to success