为援助汶川灾后重建,对某项工程进行竞标,共有6家企业参与竞标.其中A企业来自辽宁

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问题:

为援助汶川灾后重建,对某项工程进行竞标,共有6家企业参与竞标.其中A企业来自辽宁省,B、C两家企业来自福建省,D、E、F三家企业来自河南省.此项工程需要两家企业联合施工,假设每家企业中标的概率相同.

(Ⅰ)企业E中标的概率是多少?

(Ⅱ)在中标的企业中,至少有一家来自河南省的概率是多少?

考点:概率的基本性质(互斥事件、对立事件)古典概型的定义及计算
题型:解答题

下列离子方程式正确的是

A.碳酸钙加入稀盐酸中 CO32-+ H+=H2O+ CO2

B.硫酸铜溶液与氢氧化钡溶液混合Ba2++ 2OH- +SO42-+Cu2+=BaSO4↓+Cu(OH)2

C.硝酸银溶液中加入铜粉 Ag++Cu=Ag+Cu2+

D.铁粉加入稀盐酸中 2Fe+ 6H+=3H2↑+2Fe 3+

题型:解答题

下列说法中,不正确的是(  )

A.不锈钢是一种合金

B.活性炭能将硬水软化

C.塑料属于合成材料

D.铁制品表面刷漆能防锈

题型:解答题

要在市场竞争中站住脚跟,企业经营者要长“三只眼睛”:第一只眼睛要盯住企业内部员工,使企业员工的满足程度最大化;第二只眼睛盯住市场,盯住用户,使用户对企业的满意程度最大化;第三只眼睛盯住国际市场,使企业融入全球经济一体化。盯住企业员工的意义在于(  )

A.有利于减少生产商品的社会必要劳动时间

B.有利于促进社会分工的深化

C.有利于企业正当竞争

D.有利于提高劳动生产率和产品质量

题型:解答题

根据下表,完成91-95题。

2006年我国进出口总额及其增长速度

                 单位:美元

指标绝对数比上年增长%
进出口总额1760723.8
出口额969127.2
其中:一般贸易416332.1
   加工贸易510422.5
其中:机电产品549428.8
   高新技术产品281529.0
其中:国有企业191313.4
   外商投资企业563826.9
   其他企业213943.6
进口额769120.0
其中:一般贸易333219.1
   加工贸易321517.3
其中:机电产品427722.1
   高新技术产品247325.1
其中:国有企业225214.2
   外商投资企业472622.0
   其他企业93824.4

在上表所有的增长率数值中,列第三位的指标其2006 年进出口绝对数差额是()。

A.315 亿美元

B.324亿美元

C.342 亿美元

D.368亿美元

题型:解答题

Michael Porter, who has made his name throughout the business community by advocating his theories of competitive advantages, is now swimming into even more shark-infested waters, arguing that competition can save even America’s troubled health-care system, the largest in the world. Mr. Porter argues in " Redefining Health Care" that competition, if properly applied, can also fix what ails this sector.

That is a bold claim, given the horrible state of America’s health-care system. Just consider a few of its failings: America pays more per capita for health care than most countries, but it still has some 45m citizens with no health insurance at all. While a few receive outstanding treatment, he shows in heart-wrenching detail that most do not. The system, wastes huge resources on paperwork, ignores preventive care and, above all, has perverse incentives that encourage shifting costs rather than cutting them outright. He concludes that it is "on a dangerous path, with a toxic combination of high costs, uneven quality, frequent errors and limited access to care. "

Many observers would agree with this diagnosis, but many would undoubtedly disagree with this advocacy of more market forces. Doctors have an intuitive distrust of competition, which they often equate with greed, while many public-policy thinkers argue that the only way to fix America’s problem is to quash the private sector’s role altogether and instead set up a government monopoly like Britain’s National Health Service.

Mr. Porter ply disagrees. He starts by acknowledging that competition, as it has been introduced to America’s health system, has in fact done more harm than good. But he argues that competition has been introduced piecemeal, in incoherent and counter-productive ways that lead to perverse incentives and worse outcomes:" health-care competition is not focused on delivering value for patients," he says.

Mr. Porter offers a mix of solutions to fix this mess, and thereby to put the sector on a genuinely competitive footing. First comes the seemingly obvious (but as yet unrealized ) goal of data transparency. Second is a redirection of competition from the level of health plans, doctors, clinics and hospitals, to competition "at the level of medical conditions, which is all but absent". The authors argue that the right measure of "value" for the health of treatment, and what the cost is for that entire cycle. That rightly emphasizes the role of early detection and preventive care over techno-fixes, pricey pills and the other failings of today’s system.

If there is a failing in this argument, it is that he sometimes strays toward naive optimism. Mr. Porter argues, for example, that his solutions are so commonsensical that private actors in the health system could forge ahead with them profitably without waiting for the government to fix its policy mistakes. That is a tempting notion, but it falls into a trap that economists call the fallacy of the $ 20 bill on the street. If there really were easy money on the pavement, goes the argument, surely previous passers-by would have bent over and picked it up by now.

In the same vein, if Mr. Porter’s prescriptions are so sensible that companies can make money even now in the absence of government policy changes, why in the world have they not done so already One reason may be that they can make more money in the current sub- optimal equilibrium than in a perfectly competitive market--which is why government action is probably needed to sweep aside the many obstacles in the way of Mr. Porter’s powerful vision.

The word "perverse" (paragraph 2) is closest in meaning to()

A. harmful

B. economic

C. p

D. reversed

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