根据《建筑工程建筑面积计算规范》(GB/T 50353—2005)的规定，下列各项不

正常运转的机械密封其使用寿命取决于什么？

如图所示的演示实验中，A、B两球同时落地，说明(1)                     。某同学设计了如图的实验：将两个质量相等的小钢球，从斜面的同一高度由静止同时释放，滑道2与光滑水平板吻接，则他将观察到的现象是(2)                   ，这说明(3)                                                    。

At a laboratory in Germany ,volunteers slide into a machine and perform simple tasks, such as deciding whether to add or subtract two numbers , or choosing which of two buttons to press.

They have no idea that scientists in the next room are trying to read their minds-using a brain scan to figure out their intention before it is turned into action.

In the past ,scientists had been able to detect decisions about making physical movements before those movements appeared .But researchers at Berlin's Bernstein Center for Computational Neuroscience claim they have now , for the first time ,identified people's decisions about how they would later do a high-level mental activity-in this case ,adding versus subtracting.

While still in its initial stages ,the techniques may eventually have wide-ranging implications for everything from criminal questioning to airline security checks.

The research,which began in July 2005,has been of limited scope:only 21 people have been tested so far.And the 71 percent accuracy rate is only about 20 percent more successful than random selection.

Still ,the research conducted at the Max Planck Institute for Human Cognitive and Brain Sciences in Leipzig ,about 150 kilometers southwest of Berlin ,has been generating strong interest in the scientific community.

In one study ,participants were told to decide whether to add or subtract two numbers a few seconds before the numbers were flashed on a screen . Meanwhile ,a computer captured images of their brain waves to predict the subject's decision-with one pattern suggesting addition, and another subtraction.

The team ,headed by Haynes ,began its research by trying to identify which part of the mind was storing intentions. They discovered it was found in the prefrontal cortex region by scanning the brain to look for bursts of activity when subjects were given choices.

Then they went about studying which type of patterns were associated with different intentions.

"If you knew which thought signatures to look for ,you could theoretically predict in more detail what people were going to do in the future," said Haynes.

75.Which of the following is true about the experiment at the laboratory?

A.The volunteers are asked to perform very complicated tasks.

B.Everything was explained to the volunteers before the experiment.

C.The volunteers cannot see the scientists while performing the tasks.

D.The volunteers started the experiment by pressing one of the two buttons.

76.Which of the following demonstrates the major breakthrough made by the German scientists?

A.By studying the subjects' brain waves , they know what physical movements they'll make.

B.By studying the subjects' brain waves, they know what mental task they'll perform.

C.By studying criminals' brain waves ,they can help find out whether they are lying or not.

D.By studying passengers' brain waves ,they can help find out who intends to make trouble.

77.In the research which began in July 2005 only______subjects' brains were scanned and the accuracy rate was______.

A.21; 20%      B.71;20%       C.21;71%       D.20;71%

78.The group of scientists in Leiqzig were doing______what the group in Berlin were doing.

A.similar research to                  B.better research than

C.completely different things from        D.a less satisfactory job than

79.The term thought signatures in the last paragraph refers to______.

A.the subjects' intentions       B.the subjects' physical movements

C.parts of the human brain    D.the human brain wave patterns

80.From the information in the passage, it can be concluded that in the future______.

A.the intentions of people can be predicted accurately

B.it's impossible to predict accurately the intentions of people

C.no one in the world will dare to tell lies to other people

D.everyone will easily know what others are thinking about

持续期缺口管理法

近代有人曾痛切地认识到“吾人于共和政体之下备受专制政治之痛苦。”这一情形始于（）

A.清朝统治晚期

B.南京临时政府统治时期

C.北洋军阀统治时期

D.南京国民政府统治时期