This technique works fine if you have a single database maintenance activity within the logical unitof work (LUW).
如果在逻辑工作单元(LUW)中维护一个数据库活动，那么这一技巧将非常有用。
2
Unit testing of components modified during maintenance coding.
对代码维护过程中所修正代码的组件进行单元测试。
3
No lift-manufacturing unit shall borrow from other units the qualification certificate of conducting lift manufacturing, installation, renovation or maintenance activity.