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它是描述一个地区水环境自净能力大小的定量指标。
It was a quantitative target for describing of self-purification capacity of water environment of area.
youdao
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它是描述一个地区水环境自净能力大小的定量指标。
It was a quantitative target for describing of self-purification capacity of water environment of area.
youdao