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关注:1
2013-05-23 12:21
求翻译:In some systems, return flow is prevented by letting the hot water pipe from the store make a downward bend at least 30 cm (11.8 inches) deep.是什么意思?![]() ![]() In some systems, return flow is prevented by letting the hot water pipe from the store make a downward bend at least 30 cm (11.8 inches) deep.
问题补充: |
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