operating and maintenance

• 操作和维护

operating and maintenance的用法和样例：

例句

1. List Management system operation and maintenance.
   数据管理系统的操作和维护。
2. Control valve installation, the need to ensure safety, ensure the use of performance, ease of operation and maintenance, saving installation costs.
   调节阀的安装，必须确保安全性，确保使用性能，易于操作和维护，节约安装费用。