问题 问答题 简答题

怎样防止硫化氢化学事故?常见密闭空间有哪些?

答案

参考答案:

在进行密闭作业时,首先采取通风排毒措施;有条件的可安装自动报警器或私用便携式气体检测仪;其次是采用个人防护措施,要带防毒面具;在没有以上条件,可用小动物实验,测试有无危险;作业人员腰间缚以救护带或安全带,有人进行监护,一旦有所不适,可立即救出。

常见密闭空间有洞穴、隧道、下水道和出入孔道、化粪池、锅炉等,密闭空间作业都存在危险性。导致的危险主要有两种,一是因为缺氧窒息,另一种是一氧化碳、硫化氢等有毒气体。

阅读理解

Matt Haimovitz is 42 and a renowned cellist (大提琴手) in the world. He rushed into the classical music scene at the age of 12 after Itzhak Perlman, the famed violinist, heard him play.

But nothing in his family history explains where Haimovitz got his extraordinary talent. And that’s typical, Ellen Winner, a professor says.

“People are fascinated by these children because they don’t understand where their talent came from. You will see parents who say, ‘I wasn’t like this, and my husband wasn’t like this.’ It seems to sometimes just come out of the blue,” Winner says.

It’s not clear whether a prodigy’s (天才)brain is any different from the brains of other children, in part because there have been no study comparing the brains of prodigies to those of average people.

“But I believe that anything that shows up so early, without training, has got to be either a genetic or some other biological basis,” Winner says. “If a child suddenly at the age of 3 goes to the piano and picks out a tune and does it beautifully, that has to be because that child has a different brain.”

Children who are extremely gifted tend to be socially different, too, Winner says. “They feel like they can’t find other kids like themselves, so they feel strange, maybe even like a freak, and feel like they don’t have anybody to connect with. On the other hand, they also long to connect with other kids, and they can’t find other kids like themselves.”

As Haimovitz got older, he became frustrated. He wanted to play other kinds of music but felt constricted by the image and the expectations of the boy prodigy who played classical music and filled concert halls.

“When you start that early, you suddenly start to grow up in public, and I wanted to experiment,” Haimovitz says.

So he took his cello into punk rock clubs and coffee houses. He played Bach, Haydn and Hendrix. “My teacher was Leonard Rose, and we never played any 20th-century music. He didn’t like it. But once I was exposed to James Marshall “Jimi” Hendrix, Miles Dewey Davis El and others, I couldn’t really turn back. I wanted to know more,” he says.

小题1:According to some parents, prodigies’ extraordinary talent       .

A.comes unexpectedly

B.is inherited from parents

C.results from hard work

D.is trained in early times小题2:Winner seems to agree to the fact that ____.

A.average people have their particular brains

B.biology is the base of a different brain

C.a prodigy’s brain is superior to those of others

D.genes play an important role in a prodigy小题3:According to the text, gifted children are         .

A.lonely

B.easy-going

C.innocent

D.social小题4:The last paragraph is mainly about how Haimovitz was trying to         .

A.build up his friendship

B.play different kinds of music

C.set up the image of a prodigy

D.perform classical music creatively

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