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【Daily Question】Production, Storage, and Transportation - 20190804

2019-08-04View Original

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One question per day on the production, storage, and transportation version; 5 wealth points are awarded for correct answers; Effective participation grants 2 units of wealth ; Extra points will be given to those who provide a reasonable solution first. Multiple-choice question: The main indicator indicating the degree of water pollution is ( ) (A) Dissolved oxygen (B) Chemical oxygen demand (C) Total organic carbon (D) Sludge index (A) Dissolved oxygen

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