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Environmental Protection Daily Post 7.29: Reward for participation; an additional 5 rewards for answering 3 questions correctly

2016-07-29View Original

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Multiple-choice question: When extracting groundwater from multiple layers, if the water quality varies significantly among different aquifers, it is necessary to carry out extraction in a ( ) manner. A. Mixed B. Layer by layer simultaneously C. Layered D. Hybrid layers. C

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