长乐胃癌高发区饮用水致突变性研究
A study on mutagenicity of source water for drinking in Changle counte , a
通过论文构建的系统对典型地段地质环境进行评价，把福州-长乐典型地段研究区划分为优、良、中、较差、差五个级别。
The author classifies typical areas in Fuzhou-Changle into five classes : best , good , moderate , bad , and worse by the developed system .
长乐区