如何比较两个字符内容及其记者双值列表吗？
How to compare 2 list by characters content and its correspondents double values?
主要介绍了有关美国水污染防治的双值水质基准的一些内容。
The author introduces the dual-value standard for water quality control, its formulation, development and revision in the U.
由计算结果可知，压力中心曲线存在着单值区、双值区和无值区。
It is shown that pressure centre curves are all characterized by single solution, double solution and no solution regions.
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