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【Daily Question】Utilities - Water Supply and Drainage - 20200421

2020-04-21View Original

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Among the following groups of piping materials, those that can be used in domestic hot water systems are (). A. Thin-walled copper pipes, thin-walled stainless steel pipes, galvanized steel pipes, plastic-lined steel pipes (for hot water) B. Thin-walled copper pipes, PP-R pipes, UPVC water supply pipes, plastic-lined steel pipes (for hot water) C. Thin-walled stainless steel pipes, stainless steel-lined galvanized steel pipes, PB pipes, UPVC water supply pipes D. Thin-walled copper pipes, thin-walled stainless steel pipes, CPVC water supply pipes, plastic-lined steel pipes (for hot water) Answer: D

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