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DBS是采用了数据库技术的计算机系统。DBS是一个集合体，包括( )。
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公司现在持有两种证券A和B，A是某公司于2005年1月1日发行的债券，面值为1000元，5年期，票面利率为10%，每年的6月30日和12月31日发放一次利息，甲公司于2007年1月1日购入。B是某股份公司发行的股票，甲公司以20元/股的价格购入。 请回答下列互不相关的问题： 如果A债券的买入价是1100元，B股票上年发放的股利是1.8元/股，分别计算两个证券的本期收益率；
已有定义：double*P;,请写出完整的语句，利用malloc函数使p指向一个双精度型的动态存储单元______。
下列各项中。属于关系代数的基本运算的是( )。
In 1971 there were about 3,700 million people in the world. If the population were (21) evenly over the earth’ s surface there would be about 50 people to the square mile; but there are vast areas of desert and mountain and tropical forest (22) are uninhabited, (23) at the other (24) , in the great cities millions may live within a few square miles. (25) of the world’ s population is concentrated on only a small (26) of the earth’ s land surface, in the rich valleys and (27) plains, because people up to the present time have (28) to congregate in place where the climate and soil make it easy to grow food and obtain shelter. A (29) world population and the discoveries of science (30) this pattern of distribution in the future. As men slowly learn to master diseases, control floods, prevent famines, and stop wars, fewer people die every year; and in (31) the population of the world is steadily (32) . When numbers (33) , the extra mouths must be fed. New lands must be brought (34) cultivation, or land already (35) , made to yield larger crops. In some areas the accessible land is largely so intensively cultivated (36) it will be difficult to make it (37) more food. in some areas the population is so dense that the land is divided into. units (38) tiny to allow for much improvement in farming methods. (39) a large part of this farming population drawn (40) into industrial occupations, the land might be farmed much more productively by modern methods.
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