This paper discusses in detail that coulometry quickly measures chemical oxygen demand of low polluted domestic sewage of the school and high polluted industrial sewage.
本文详细论述了库仑法快速测定低污染的校区生活污水和高污染的工业污水中的化学耗氧量。
The lead role in this film is played by an elementary school student. He describes life for his family living in a polluted area in the first person.
本故事主角是一位仍就读小学的男童，以第一人称口吻，自述全家长期居住在污染区的生活感受。
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