| 1. | Operation and maintenance costs per unit decrease as the size of the treatment facility increases .
随着处理厂规模的扩大，降低了处理单位体积废水的维护管理费用。 |
| 2. | Operation and maintenance of sdec ' s 121 diesel engine
121柴油机使用保养介绍一 |
| 3. | Code for operation and maintenance of nuclear power plants
核电厂的操作和维修规程 |
| 4. | Compact in design , easy for operation and maintenance
外型轻巧，操作及维护容易。 |
| 5. | Operation and maintenance of hydro - generators , guide for
水力发电机运转和维护指南 |
| 6. | Guide for operation and maintenance of turbine generators
涡轮发电机操作和维护指南 |
| 7. | Operation and maintenance of gt fuel gas system
燃气轮机燃料气系统的运行维护 |
| 8. | Operation and maintenance for magnetotelluric instruments
大地电磁测深仪使用与维护 |
| 9. | It is convenient for operation and maintenance
本产品便于操作，易于维修。 |
| 10. | Operation and maintenance of t6114 cng engine
6114天然气发动机的使用和维护 |
