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- The chemical oxygen demand(COD)and thebiochemical oxygen demand in 5 days(BOD5)of prime sewage were more than paddy field wa-ter in SIA. 原污水的化学需氧量（COD）和5日生化需氧量（BOD5）高于污灌区稻田水；
- Simultaneity give out the chemical oxygen consumption(COD)and total organic carbon(TOC)the linear relationship equation. 同时给出了化学耗氧量(COD)和总有机碳(TOC)之间的线性关系方程。
- By 2005, China will be integrated environment-water pollution, and through engineering measures for the chemical oxygen demand and ammoniac nitrogen emissions reduced by 10%. 到2005年，中国将对受到污染的水环境进行综合整治，并通过工程措施使化学需氧量和氨氮的排放总量削减10%25。
- An experiment was made on the pharmaceutical wastewater treatment with the contact oxidation process by adding effective microorganisms(EM) to remove the chemical oxygen demand(COD). 应用生物接触氧化法投加有效微生物菌群(EM)对制药废水中化学需氧量的去除效果进行试验研究和分析。
- The chemical symbol for copper is "Cu". 铜的化学符号是Cu。
- The chemical can behave as an acid. 这种化学制品能起酸的作用。
- The chemical companies are poisoning our rivers with effluent. 这些化学公司排出废水污染著我们的河流。
- The chemical must then be salted out and allowed to dry. 之后，这化学药品必须加盐分离，晾干。
- Fast determination of the chemical oxygen demand (COD) in water 水体中化学需氧量(COD)的快测定
- The iron in the chemical compound must be purged. 化学混合物中的铁必须清除。
- 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
- The explosion at the chemical factory caused a major pollution scare. 化工厂发生爆炸引起了害怕污染的巨大恐慌。
- Water quality - Determination of chemical oxygen demand (COD). 水质。氧的化学消耗量的测定(重铬酸钾法)
- The explosion at the chemical factory cause a major pollution scare. 化工厂发生爆炸引起了害怕污染的巨大恐慌。
- The iron in the chemical compound must be purged . 化学混合物中的铁必须清除。
- About half the chemical engineers have checked out. 大约有一半化学工程师已经退房。
- What is the character of the chemical? 这一化学物质有什么特性?
- The chemical destroys botulinus. 该化学物质能消灭肉毒杆菌。
- The chemical beds are provided in duplicate. 化学吸湿剂是成对设置的。
- The chemical formula for salt is NaCl. 盐的化学分子式是
