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如果市场组合收益率和无风险收益率分别是15%和5%．那么被市场低估的证券是 ()
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A granted patent is the result of a bargain struck between an inventor and the state, by which the inventor gets a limited period of monopoly and publishes full details of his invention to the public after that period terminates.
only in the most exceptional circumstances is the life-span of a patent extended to alter this normal process of events.
The longest extension ever granted was to Georges Valensi; his 1939 patent for color TV receiver circuitry was extended until 1971 because for most of the patent's normal life there was no colour TV to receive and thus no hope of reward for the invention.
Because a patent remains permanently public after it has terminated, the shelves of the library attached to the patent office contain details of literally millions of ideas that are free for anyone to use and, if older than half a century, sometimes even re-patent. Indeed, patent experts often advise any other inventer's right is to plagiarize a dead patent likewise, because publication of an idea in any other form. permanently invalidates further patents on that idea, it is traditionally safe to take ideas from other areas of print. Much modem technological advance is based on these presumptions of legal security.
Anyone closely involved in patents and inventions soon learns that most "new" ideas are, in fact, as old as the hills. It is their reduction to commercial practice, either through necessity or dedication, or through the availability of new technology, that makes news and money. The basic patent for the theory of magnetic recording dates back to 1886. Many of the original ideas behind television originate from the late 19th and early 20th century. Even the Volkswagen rear engine car was anticipated by a 1904 patent for a cart with the horse at the rear.
Which of the following is TRUE according to the passage？
如下图所示，AC为钢杆[δ]，=40MPa，A1=14cm2，BC为木杆，[δ]2=10MPa，A2=100cm2，AC长为2m，A、B、C连接处均可视为铰接，从强度方面计算竖向荷载F的最大许用值为()。
银行要建立激励机制,这个激励机制既要有精神鼓励,也要从物质上表现出来,给予物质奖励。()
客户关系管理强调客户价值、银行价值的高度统一。()
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