某突发事件,在不采取任何预防措施的情况下发生的概率为0.3,一旦发生,将造成40

题型:解答题

问题:

某突发事件,在不采取任何预防措施的情况下发生的概率为0.3,一旦发生,将造成400万元的损失,现有甲、乙两种相互独立的预防措施可供采用,单独采用甲、乙预防措施所需的费用分别为45万元和30万元,采用相应预防措施后此突发事件不发生的概率为0.9 和0.85,若预防方案允许甲、乙两种预防措施单独采用、联合采用或不采用,请确定预防方案使总费用最少。

(总费用=采取预防措施的费用+发生突发事件损失的期望值)

考点:离散型随机变量的期望与方差概率的基本性质(互斥事件、对立事件)
题型:解答题

集体合同的类型有()。

A.一般性的集体合同

B.专项集体合同

C.区域性集体合同

D.行业性集体合同

E.特殊性集体合同

题型:解答题
如图所示,AB是一质量为m的均匀细直杆,A端靠在光滑的竖直墙壁上,B端置于水平地面上,杆身与竖直方向夹角为θ,杆与地面的摩擦系数为μ,保持平衡,则此时杆与地面的摩擦力为(  )

A.mgtgθ

B.mgsinθ

C.μmg

D.μmg

题型:解答题

与藜芦相反的药有:()

A.白蔹

B.苦参

C.丹参

D.细辛

E.白芍

题型:解答题

Throughout the 19th century and into the 20th, citizens of the United States maintained a bias against big cities. Most lived on farms and in small towns and believed cities to be centres of (1) , crime, poverty and moral (2) Their distrust was caused, (3) , by a national ideology that (4) farming the greatest occupation and rural living (5) to urban living. This attitude (6) even as the number of urban dwellers increased and cities became an essential (7) of the national landscape. Gradually, economic reality overcame ideology. Thousands (8) the precarious (不稳定的) life on the farm for more secure and better paying jobs in the city. But when these people (9) from the countryside, they carried their fears and suspicions with them. These new urbanities, already convinced that cities were (10) with great problems, eagerly (11) the progressive reforms that promised to bring order out of the (12) of the city.

One of many reforms came (13) the area of public utilities. Water and sewerage systems were usually operated by (14) governments, but the gas and electric networks were privately owned. Reformers feared that the privately owned utility companies would (15) exorbitant (过渡的) rates for these essential services and (16) them only to people who could afford them. Some city and state governments responded by (17) the utility companies, but a number of cities began to supply these services themselves. (18) of these reforms argued that public ownership and regulation would (19) widespread access to these utilities and guarantee a (20) price.

4()

A.proclaimed

B.exclaimed

C.claimed

D.reclaim

题型:解答题

2011年10月18日,中共十七届五中全会通过的《中 * * 关于深化文化体制改革推动社会主义文化大发展大繁荣若干重大问题的决定》指出,创作生产更多无愧于历史、无愧于时代、无愧于人民的优秀作品,是文化繁荣发展的重要标志。必须全面贯彻为人民服务,为社会主义服务的方向和百花齐放、百家争鸣的方针,立足发展先进文化、建设和谐文化,激发文化创作生产活力,提高文化产品质量,发挥文化引领时尚、教育人民、服务社会、推动发展的作用。

从《生活与哲学》角度,结合上述材料说明文化创作时应该注意哪些问题?

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