原理 (1)全血的活性系数(activity coeffi-eient of erythrocyte glutathione reductase，ACEGR)测定：维生素B2的衍生物黄素腺嘌呤二核苷酸(FAD)是谷胱甘肽还原酶(EGR)的辅酶，可促进红细胞内...
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总之，种种约束限制了关系数据库系统的灵活性，并因此限制了系统用户在数据库内部实现复杂、交互式模型的能力。
Overall, these restrictions limit the flexibility of relational database systems and, thus, the ability of users of such systems to implement complex, interactive models within the database itself.
即使关系数据库缺少解决方案所需的灵活性，与替代技术相比，它们仍然更成熟，更适合满足复杂的业务需求。
Even when relational databases lacked the flexibility required for a solution, they were still more mature and better suited for heavy demands than the alternatives.
为克服这种约束并最大化实现关系数据库系统的灵活性，DB2 V9.5 引入了全局变量的概念。
To overcome this restriction and to maximize the flexibility of a relational database system, DB2 V9.5 introduces the concept of global variables.
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