【Daily Topic】【HVAC Version 20170425】
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Participation reward: 2 Wealth. Correct reward: 6 wealth. Multiple-choice question: To prevent potable water from being contaminated due to backflow, designs must comply with relevant standards; the minimum air gap between the water supply outlet and the overflow level of the water-using equipment should be ( ). A. It must not be smaller than the diameter of the water supply pipe at the distribution outlet. B. It must not be smaller than 1.5 times the diameter of the water supply pipe at the distribution outlet. C. It must not be smaller than 2.5 times the diameter of the water supply pipe at the distribution outlet. D. It must not be smaller than 2.0 times the diameter of the water supply pipe at the distribution outlet. C
B. It shall not be less than 1.5 times the diameter of the water supply pipe at the water distribution outlet
C. It shall not be less than 2.5 times the diameter of the water supply pipe at the water distribution outlet