通过分析，提出考试系统成绩的安全性管理的多级管理模式，每一级均起到一定的保护作用。
However, there are several security problems in such databases, such as modifying and copying grade easily. A multi-level management model of grade security is presented.
通过分析，提出考试系统成绩的安全性管理的多级管理模式，每一级均起到一定的保护作用。
However, there are several security problems in such databases, such as modifying and copying grade easily. A multi-level management model of grade security is presented.
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