- “落水喉”
- 下行供水管
- 向下進(jìn)刀
- downfeed system: 上分式系統(tǒng); 下行上給式; 向下給料系統(tǒng)
- downfeed two-pipe household system: 上分雙管式戶內(nèi)系統(tǒng)
- two pipe direct downfeed system: 下給式雙管熱水供暖系統(tǒng)
- two pipe hot water downfeed system: 雙管熱水上分式供暖系統(tǒng)
- two-pipe hot water downfeed system: 雙管下給式熱水供暖系統(tǒng)
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