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物业服务企业的一级资质等级中，物业管理专业人员以及工程、管理、经济等相关专业粪的专职管理和技术人员不少于( )人。
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企业价值最大化目标，是在权衡企业相关者利益的约束下实现所有者或股东权益的最大化。( )
数据结构分为线性数据结构和非线性数据结构，带链的队列属于______。
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.
某公司下设甲、乙两个投资中心。甲投资中心的投资额为200万元，投资利润率为12%。乙投资中心的投资利润率为16%，剩余收益为18万元：该公司要求的最低投资利润率为10%。该公司决定追加投资200万元。若投向甲投资中心，每年可增加利润26万元；若投向乙投资中心，每年可增加利润34万元。 要求： 若向甲投资中心追加投资，计算追加投资后甲投资中心的剩余收益和投资利润率；
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