多重运算问题是指要用多于一个步骤来解题。
A multistep problem is a problem which requires more than one step in order to solve it.
其基本思想是：利用测试码与测试响应的简单逻辑运算进行多重故障定位。
The main idea is to locate multiple faults with simple logical operations of test codes and test responds.
模型表明，有效权限集合与多重权限合并运算具有半群结构。
The model shows that the available permission set together with multi-permission combination operator is a hemigroup.
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