求助,preferred operating region 是什么意思? sweet zone倒是一个不错的词,介绍一篇讲述sweet zone 的文章: http:///issuearticle.asp?articleid=208 many people in our industry use the term, bep (best efficiency point) to define the pump’s “sweet zone.” although the bep exists, it is mostly impossible to operate a pump consistently at this point. system and operational variances drag the pump away from this point. a pump will oscillate through and around the bep as the system changes, even in a correctly designed pumping system. it is more practical to consider a good-to-best efficiency zone. this is what i call the sweet zone. 我摘录一点,供大家阅读 查看更多