| 1. | Water quality - determination of the chemical oxygen demand 水质.化学需氧量的测定 |
| 2. | Cod water quality - determination of chemical oxygen demand 水质.化学需氧量的测定 |
| 3. | Photo of chemical oxygen demand in the kai tak nullah 启德明渠kn4的化学需氧量图片 |
| 4. | Exploration of the problems of cod determination method 化学需氧量测定法存在问题探讨 |
| 5. | Cod verification regulation of chemical oxygen demand meters 化学需氧量 |
| 6. | Water quality - determination of the chemical oxygen demand - dichromate method 水质化学需氧量的测定重铬酸盐法 |
| 7. | Cod . leachate . determination of the chemical oxygen demand . potassium dichromate method 生活垃圾渗沥水.化学需氧量 |
| 8. | Municipal sewage . determination of chemical oxygen demand . potassium dichromate method 城市污水.化学需氧量的测定.重铬酸钾法 |
| 9. | Chemical oxygen demand cod 化学需氧量 |
| 10. | Chemical oxygen demand co 化学需氧量 |