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【Daily Topic】【HVAC Version 20170605】

2017-06-05View Original

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Participation reward: 2 Wealth. Correct reward: 6 wealth. Multiple-choice question: In a residential building with a total of 560 people, wastewater and fecal waste are treated separately; each person generates 20 liters of wastewater per day and 0.4 liters of sludge per day. The retention time for wastewater is 24 hours, and the cleaning cycle is half a year. What is the effective volume of the septic tank? (  ) A. 13m3  B. 18m3  C. 25m3  D. 30m3 A

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