问题 问答题 简答题

什么是焓?

答案

参考答案:

在某一状态下单位质量工质比容为v,所受压力为p,为反抗此压力,该工质必须具备pv的压力位能。单位质量工质内能和压力位能之和称为比焓。

比焓的符号为h单位KJ/kg。其定义式为:

h=u十pvKJ/kg

对m千克工质,内能和压力位能之和称为焓,单位kJ,即

H=mh=U+pV

由h=u+pv可看出,工质的状态一定,则内能U及PV一定,焓也一定,即焓仅为状态所决定.所以焓也是状态参数。

单项选择题

请根据以下信息,回答第86-90 题: 张德宝,昌盛电线股份有限公司的董事长,是公司的最大股东,该公司在中小企业版上市交易,主营业务是生产铜质电线,产品主要销往北美地区。金融理财师小刘一直以来为张德宝提供私人理财服务,有时也在力所能及的范围内为他的公司理财提供咨询和建议,建立了良好的关系。张德宝持有现金1,000 万元人民币和200 万美元,拥有昌盛电线30%的股份,拥有2 处住宅此外再无其他财产或投资。2008 年初,他请来小刘讨论以下几个问题: 一、帮助分析公司的财务状况以及发展规划; 二、个人理财规划; 三、风险管理。 昌盛及其主要竞争对手民生、永久、联捷的财务数据如下:

注: ①.公司总股本是1亿股,目前股票价格5.8元; 公司2007年分红以及未来分红预测如下:

分红比率40%,2007年底刚分红1,560万元。根据历史经验,预计到2010年底,昌盛股票的市盈率将达到20倍,此后将一直稳定在这个水平。 ③.电线制造行业平均的β系数为1.2,市场预期收益率是12%,无风险利率是3%。

因为昌盛的股价被低估了,张德宝颇感郁闷,咨询小刘的意见。小刘推荐股份回购的策略,并耐心向张德宝解释股份回购的作用。以下解释中,正确的是:()

A.股份回购可以提高公司的财务杠杆,从而提高股东回报率。

B.股份回购通常会向市场发出股价被高估的信号。

C.在考虑税收影响的情况下,股份回购与现金分红有同样的作用。

D.股份回购将增加张德宝对公司的控制。

阅读理解

Eat to Excel

How fit are you? Do you look after yourself? Do you eat healthily or do you eat anything you like? Premier League football club Aston Villa are encouraging their players and local children to eat healthy food. They know that what you eat is the key to success.

How fit is a footballer?

Could you run ten kilometers in 90 minutes? A professional footballer can. Footballers have to be strong, quick, skillful and creative in their moves. Every Premier League club makes sure it has a good coaching scheme and a well-planned fitness program. They also ensure that players have the practice and training that will prepare them for matches. What else do you think clubs pay special attention to? A good stadium? Anything else? What about the food they eat?

Eating the right thing

A good diet is a fundamental part of sport these days. Aston Villa manager Martin O’Neill’s sport and health experts have chosen a secret weapon --- organic food (food grown without chemicals). Fitness manager Jim Henry eats with his players and said: “I chose to switch to organic food for Aston Villa because I’ve read studies showing that organic food has higher levels of vitamins, minerals and antioxidants.” He believes that the best way to get these is to eat the very best fresh food.

What to eat after the match

Head chef at Aston Villa, lan Edge, feeds players with the best food as soon as they finish an away match. He says: “Food is very important to sports stars and particularly after a game. There is an hour of opportunity when they need to eat to get the best muscle strength, so I hand out meals on the coach on the way home. If we can make one per cent difference to the players by using organic food, then it is worth it.”

Teaching healthy eating

Everyone at Aston Villa enjoys organic food at their training ground. But the club is also worried about the unhealthy diet among local children who prefer sweets and unhealthy fast food. As part of their work in the community, Aston Villa has opened up their kitchen and invited children from local schools to come and learn how to cook with the help of the Villa head chef. Villa midfielder, Nigel ReoCoker, visited the children on the opening day. “The kitchen promotes healthy eating and a healthy lifestyle.” he said.

A final word from the kitchen

Head chef Ian says: “Footballers know how important food is to their profession and nine times out of ten, they go for the healthiest option.” Do you watch your diet? If you do and you keep yourself fit, you can be a winner!

小题1:Every Premier League Club provides footballers with ______________.

A.a good coach

B.a fitness center

C.proper practice and training

D.a delicious diet小题2:According to Jim Henry, ___________________.

A.he believes the studies he has read about organic food

B.he will only eat organic food with his players

C.he thinks food is especially important after a game

D.he chose organic food as a secret weapon for footballers小题3:We can learn from the passage that ___________________.

A.people can make one percent difference to players by using organic food

B.only a few footballers pay attention to the healthy eating

C.footballers in Aston Villa usually eat on their way to the match

D.footballers in Aston Villa usually eat some food within an hour after a match.小题4:Why has Aston Villa invited children from local schools?

A.Because they want to teach kids how to cook delicious food.

B.Because they want to teach kids to play football.

C.Because they are fond of the kids in the community.

D.Because they intend to promote healthy eating.