问题
单项选择题
下列( )不是并行数据库的主要研究方向。
A．物理存储结构的研究
B．操作算法的设计与实现
C．数据模型设计
D．查询优化
答案
参考答案：C
解析： 并行数据库的研究主要包括以下3个方面：并行数据库物理存储结构的研究、并行数据库操作算法的设计与实现和并行数据库的查询优化。
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下列( )不是并行数据库的主要研究方向。
A．物理存储结构的研究
B．操作算法的设计与实现
C．数据模型设计
D．查询优化
参考答案：C
解析： 并行数据库的研究主要包括以下3个方面：并行数据库物理存储结构的研究、并行数据库操作算法的设计与实现和并行数据库的查询优化。
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| The position of children in American family and society is no longer what it used to be. The_1_ family in colonial(殖民时期的)North America was mainly concerned with survival and beyond that, its own economic prosperity. Thus, children were 2 in terms of their productivity(生产能力), and they played the role of producer quite early. Until they fulfilled this role, their position in the family was one of subordination(附属). With the_3_of the society. the position of children in the family and in the society became more important. In the complex and technological society that the United States has become, each_4_must fulfill a number of personal and occupational_5_and be in contact with many other members. Therefore, viewing children as necessary members of society means that they are_6_more as people in their own fight than as those of subordination. This acceptance of children as_7 participants in the family is reflected in various laws_8_the rights of children and in the social and public welfare programs. This new_9_of children and the frequent contact between the members of society has also 10 an increasing interest in child-raising techniques. People today spend much time seeking the proper way to 11 children. Nowadays, the socialization of the child in the United States is a 12 transaction(事务)between parent and child 13 a one-way, parent-to-child training 14 . As a consequence, socializing children and 15 with them over a long period of time is for parents a mixture of pleasure, satisfaction, and problems. | ||||
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