图书馆读者用机的大量增加,使得公用计算机软件系统的维护管理成了管理员最为棘手的一个问题。
Participants were given eight different tasks testing how the payment levels affected performance. Some tasks involved problem-solving skills, others concentration, and others required creativity.实验对象要完成八个不同的任务,以此来发现报酬级别对表现的影响,其中有的任务要求有解决问题的技巧,有的需要高度注意力,还有的需要发挥创造力。
However, due to the mismatch between the XML's tree structure and flat relational tables, mapping XML document to relational database is an involved problem. So it becomes a pop research direction.然而由于复杂的树形XML文档和简单平坦的关系型数据库表结构之间固有的不匹配,使得XML到关系型数据库的映射实现十分困难,因此成为当前的一个热门研究课题。