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出铁次数是怎样确定的？

答案

参考答案：

高炉的出铁次数是根据高炉昼夜出铁次数的经验公式计算出来的。其经验公式为：n＝QP/T安，各参数含义为：n－昼夜出铁次数；P－高炉昼夜出铁量；T安－炉缸安全容铁量；Q－出铁不均匀系数，取值1.2。

单项选择题

在证券投资中，因通货膨胀带来的风险是 ( )。

A．违约风险

B．利息率风险

C．购买力风险

D．流动性风险
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单项选择题

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 (分配) 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(刺激), 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. \

Meditators manage their daily tasks better because they ______.

A．are given less pressure

B．allocate their attention better

C．have more stimuli for life

D．practice them more frequently
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