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【Daily Question】Utilities - Water Supply and Drainage - 20191230

2019-12-30View Original

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In foam fire extinguishing systems, there are high-expansion, medium-expansion, and low-expansion foams, which should be distinguished based on (  ).   A. Ratio of foam concentrate to water  B. Foaming ratio of the foam concentrate  C. Mass ratio of foam concentrate to water  D. Density ratio of foam concentrate to water. Answer: B

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