依据《矿山安全法》的规定，由（）决定的行政处罚，按照现行职责分工由有关主管部门决定。

美国密执安大学5名学习航空航天技术的大学生搭乘NASA的飞艇参加了“微重力学生飞行机会计划”。飞行员将飞艇开到6000 m的高空后，让其由静止下落，以模拟一种微重力的环境。下落过程中飞艇所受空气阻力为其重力的0.04倍。这样，可以获得持续25 s之久的失重状态，大学生们便在这段时间内进行关于微重力影响的实验。紧接着，飞艇又向下做匀减速运动。若飞艇离地面的高度不得低于500 m，重力加速度g取10 m/s²，试求：

（1）飞艇在25 s内下落的高度；

（2）在飞艇后来的减速过程中，大学生对座位的压力是重力的多少倍？

脐带脱垂是胎膜破裂后：

A．脐带脱出胎头下方

B．脐带经宫颈进到 * * 内，甚至经 * * 显露于外阴部

C．脐带脱出胎头前方

D．脐带脱出位于胎头额部

E．脐带脱出胎先露的下方

线路大、中修办理工程交验时，施工单位应提供主要材料使用（）。

阅读理解

     Are you feeling blue? An American study suggests that being surrounded by happy friends and

neighbors could have more of an effect on your happiness than money. That is the finding of researchers

from Harvard University and the University of California at San Diego.

     Nicholas Christakis and James Fowler studied the emotional health of more than four thousand seven

hundred people. They used information from the Framingham Heart Study. That study began sixty years

ago in the American community of Framingham, Massachusetts. It was started to learn more about the

risks of heart attack and stroke. For the new study, the researchers examined the emotions of the men

and women in the Framingham Heart Study. The information was gathered from 1983 to 2003.

     The researchers found that friends of happy people had a greater chance of being happy themselves.

That means that happiness spreads, or has a contagious effect, among people. And, the smaller the

physical distance between friends, the larger the effect they had on each other's happiness. For example,

a person was twenty percent more likely to feel happy if his/her friend living within one and a half

kilometers was also happy. Having a happy neighbor who lived next door increased an individual's

chance of being happy by thirtyfour percent.The effects of friends' happiness lasted for up to a year.

     Another finding was that people who worked together or were married did not have as much of an

effect on happiness levels as friends did. The researchers said this was often true among friends of the

same sex. A report on the findings was published this month in the British Medical Journal.America's

National Institute on Aging helped to pay for the study. Some researchers who were not involved with

the study questioned its findings. They said the results could be disputed(争议) unless a separate study

showed similar findings.

1. What does this text mainly tell us?

A. How to live a happy life?

B. One's happiness influences others.

C. How to keep emotions healthy?

D. A scientific experiment.

2. From this text we know that ________.

A. Nicholas and James based their findings on the study of a medical research

B. Nicholas and James have been doing their research for more than twenty years

C. a person with a happy friend has more chance of feeling blue

D. a happy person is more likely to suffer from heart attack

3. The underlined word "contagious" in the third paragraph means ________.

A. contacting  

B. embarrassing

C. spreading

D. frightening

4. According to this text, which of the following four persons may have a larger effect on Mrs. Smith's

happiness?

A. Mr. Green, Smith's former classmate.

B. Mr. Thomas, Smith's colleague.

C. A friend in another city.

D. A happy single lady next door.

反流性食管炎与心绞痛的鉴别主要表现为（）

A.病史

B.疼痛部位及性质

C.食管滴酸实验及心电图检查

D.食管测压

E.内镜检查