综合安全技术封闭楼梯间除应符合疏散楼梯间的一般设置要求外,还应符合的要求中不正确的是

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问题:

综合安全技术

封闭楼梯间除应符合疏散楼梯间的一般设置要求外,还应符合的要求中不正确的是( )。

A.楼梯间应靠外墙,并应直接天然采光和自然通风

B.高层建筑的楼梯间应设面向疏散方向开启的乙级防火门

C.楼梯间的首层紧接主要出口时,可将走道和门厅内形成扩大的封闭楼梯间

D.楼梯间入口处应设前室、阳台或凹廊

考点:安全工程师安全生产技术安全生产技术
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PDH有哪些缺点?

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Reading comprehension.

     In meditation (冥想), people sit quietly and focus their attention on their breath. As they breathe in and

out, they attend to their feelings. As thoughts go through their minds, they let them go. Breathe. Let go.

Breathe. Let go.

     According to a recent study at the Insight Meditation Society in Barre, Massachusetts, three months of

training in this kind of meditation causes a marked change in how the brain allocates attention. It appears

that the ability to let go thoughts that come into mind frees the brain to attend to more rapidly changing things

and events in the outside world. Expert mediators are better than other people at catching such fast-changing

stimuli, like facial expressions.

     The study provides evidence for changes in the workings of the brain with mental training. People can

learn and improve abilities of all sorts with practice, everything from driving to playing the piano. The study

has shown that meditation is good for the brain. It appears to reduce pressure and promote a sense of well-

being.

     In an experiment, 17 volunteers with no meditation experience in the experimental group spent three

months meditating 10 to 12 hours a day. A control group also with no meditation experience meditated for

20 minutes a day over the same period. Both groups were then given the tests with two numbers in a group

of letters. As both groups looked for the numbers, their brain activity was recorded.

     Everyone could catch the first number. But the brain recordings showed that the less experienced

mediators tended to grasp the first number and hang onto it, so they missed the second number. Those with

more experience gave less attention to the first number, as if letting it go, which led to an increased ability to

grasp the second number. This shows that attention can change with practice.

     Just ask Daniel Levision, who meditated for three months as part of the study. "I am a much better

listener," he said. "I do not get lost in my own personal reaction to what people are saying."

1. The underlined word "them" in Paragraph l refers to _____. [ ]

A. thoughts

B. minds

C. people

D. feelings

2. In the experiment, volunteers doing meditation for longer hours _____. [ ]

A. usually ignored the first number observed

B. were used to memorizing numbers in groups

C. were more likely to catch both of the numbers

D. paid more attention to numbers than to letters

3. What can we infer from the passage?[ ]

A. Mediators are given less pressure.

B. Mediators can manage their daily tasks better.

C. Mediators can play the piano better.

D. Mediators are good at using numbers.

4. What can be concluded from the passage? [ ]

A. Meditation improves one's health.

B. Mediators have a good sense of hearing.

C. Brain activity can be recorded.

D. Human attention can be trained.

题型:单项选择题

根据合同法律制度的规定,下列各项中,不能为技术开发合同标的的有( )。

A.现有产品的改型

B.现有产品的工艺变更

C.现有产品的材料配方调整

D.对技术成果的验证、测试

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优质的藻种具有什么特征?

题型:单项选择题

冷气系统膨胀阀或贮液器阻塞时,高、低压表显示()。

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