城镇污水处理厂COD浓度变化规律的研究

由于北方冬季比较漫长，城镇污水排放COD浓度符合居民生活用水习惯的实际情况。在调研区域，城镇生活污水COD浓度平均值为234．30mg／L，基本符合典型的生活污水的水质，属于浓度较低的生活污水。

Consumption of Hybrid Sunflower Cultivation Techniques

Sunflower crops are more common,not only for ornamental flower cultivation,there is a special type of sunflower cultivation of food.As a cash crop,the yield of the crop was cultivated by the most valued part.Order and a good income,you need to engage in good yield as a guarantee.Edible sunflower yield cultivation techniques,especially the consumption of high-yielding hybrid sunflower cultivation techniques,the vast number of issues of concern to growers.Combined consumption of the characteristics of hybrid sunflower itself,the author of its cultivation technology for a shallow analysis,for all to share.