Starting with one circuit, attach a hose to the purge &balancing valve. (Note - the hose must terminate at a suitable floor drain or an outdoor area.是什么意思_Starting with one circuit, attach a hose to the purge &balancing valve. (Note - the hose must terminate at a suitable floor drain or an outdoor area.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句