They can be used surgically during maintenance to drill down to specific sections of an application that need correction.
它们也可以用在维护期间，具体到应用软件某个特定的，需要修改的部分。
2
The drill and petroleum extraction tools test-well is built in room, that not only can ensure that test environment meeting the test request but also is very convenience for equipment maintenance.
整个钻采工具试验井建在专用实验室内，既可保证试验环境符合测试要求，又可极大的方便设备维护。
3
At the same time, also supporting the production of a variety of drill RIGS, drill bits, and provide equipment maintenance services.