Methods: Sampling was carried out in natural about water source of the Yellow River and running water in HuiNong area.
方法：对惠农地区黄河水和自来水进行采样分析。
Objective: to understand the pollution of the Yellow River in HuiNong of NingXia Autonomous Prefecture and in natural water source and running water quality.
前言：目的：掌握黄河水源宁夏惠农段污染现状和目前自来水水质现状。
Qingzhou Huinong Machinery Co. , LTD, located in Qingzhou, Shandong Province, is specialized in production of the aeration-cooling and temperature-controlling equipments.
青州市惠农机械有限公司是生产通风降温、加温加湿设备的专业厂家，位于山东省青州市。
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