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【单选题】
In which of the following games is it clearly the case that the cooperative outcome of the game is good for the two players and good for society?A.
Two guilty criminals have been captured by the police, and each prisoner decides whether to confess or to remain silent.
B.
Two airlines dominate air travel between City A and City B, and each airline decides whether to charge a “high” airfare or a “low” airfare.
C.
Two duopoly firms account for all of the production in a market, and each firm decides whether to produce a “high” amount of output or a “low” amount of output.
D.
Two oil companies own adjacent oil fields over a common pool of oil, and each company decides whether to drill one well or two wells.
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【简答题】直流电动机的感应电动势与电动机结构Ce、[填空(1)]和电动机转速n有关。当电动机制造好以后，与电动机结构有关的常数Ce[填空(2)]，因此电枢电动势仅与气隙磁通和[填空(3)]有关，改变转速和磁通均可改变电枢电动势的大小。
【简答题】Giving loans to the poor The Grameen Bank is an organisation started in Bangladesh that makes small loans (known as micro-credit) to poor people, without asking for collateral. The system is based on ...
【简答题】基因疫苗是将编码病原体蛋白的基因插到质粒上，然后将之导入人或动物体内，让其在宿主细胞中表达，诱导机体产生免疫应答。其主要机制如下图：据图回答有关问题： 与初次免疫比较，当机体再次接触该病原蛋白时免疫的特点是（），这与初次免疫时产生的（）（填图中的编号）细胞密切相关。
【简答题】Under such a plan, the government would competition among insurance companies so that everyone gets care at lower cost. 根据这样一个计划,政府会控制保险公司之间的竞争,这样每个人都能以较低价格获得保险
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