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与期货一样,期权通常也是一种标准化的合约。目前,我国在股权分置改革中推出的金融衍生品种有()
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经济萧条、正常、繁荣可能发生的概率分别为25%、55%、20%，有一种风险资产组合在三种情况下的收益率分别为1%、5%、12%。目前，市场上股票型基金、国库券、债券型基金分别可向投资者提供10.6%、5.4%、7.8%的收益率。则理性的投资者是否会投资于该风险资产组合？()
在石油天然气开采中，为防止硫化氢中毒事件的发生，国家标准中规定硫化氢在空气中的允许含量上限是()。
某股票X未来的情况预期如下： 该股票的预期收益率和标准差分别为()。
Comparisons were drawn between the development of television in the 20th century and the diffusion of printing in the 15th and 16th centuries. Yet much had happened【C1】______ . As was discussed before, it was not【C2】______ the 19th century that the newspaper became the dominant pre-electronic【C3】______ , following in the wake of the pamphlet and the book and in【C4】______ of the periodical. It was during the same time that the communications revolution【C5】______ up, beginning with transport, tile railway, and leading【C6】______ through the telegraph, the telephone, radio, and motion pictures【C7】______ the 20th-century world of the motor car and the airplane. Not everyone sees that process in【C8】______ . It is important to do so.
It is generally recognized,【C9】______ , that the introduction of the computer in the early 20th century,【C10】______ by the invention of the integrated circuit during the 1960s, radically changed the process,【C11】______ its impact on the media was not immediately【C12】______ As time went by, computers became smaller and more powerful, and they became "personal" too, as well as【C13】______ , with display becoming sharper and storage【C15】______ increasing. They were thought of, like people,【C14】______ generations, with the distance between generations much【C16】______
It was within the computer age that the term "information society" began to be widely used to describe the【C17】______ within which we now live. The communications revolution has【C18】______ both work and leisure and how we think and feel both about place and time, but there have been【C19】______ views about its economic, political, social and cultural implications. "Benefits" have been weighed【C20】______ "harmful" outcomes. And generalizations have proved difficult.
【C1】
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