地下水均衡监测试验，河南省先后建立有封丘、郑州、商丘三个均衡场。
Three groundwater graded fields have been built in Fengqiu, Zhengzhou and Shangqiufor the experiment of groundwater graded monitoring in Henan Province.
地下水均衡监测试验，河南省先后建立有封丘、郑州、商丘三个均衡场。
Three groundwater graded fields have been built in Fengqiu, Zhengzhou and Shangqiufor the experiment of groundwater graded monitoring in Henan Province.
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