The ecological risks of soil heavy metals in the sewage irrigated area of the Huafei River in Kaifeng City were discussed with the method of potential ecological risk index invented by Hakanson.
以开封市化肥河污灌区为例,采用潜在生态风险指数法对土壤重金属污染进行了生态风险评价。
As a foreign governmental loan project of first run in Henan Province, the west wastewater treatment plant in Kaifeng City has been constructed.
开封市西区污水处理厂是河南省第一批利用外国政府贷款兴建的污水处理工程。
Kaifeng City is the only one strong sales of the quality of the machine tools company.
是开封市唯一一家销售质量过硬的机械工具的公司。