varying head

基本解釋

Water infiltration of water storage pit irrigation is under varying-head conditions.
蓄水坑灌條件下的土壤入滲是在變水頭作用下進行的。
The research results will have an important value for to study further varying-head infiltration and soil moisture characteristic of water storage pit irrigation .
這一研究成果爲進一步研究蓄水坑灌條件下的變水頭入滲及土壤水分運動特性奠定基礎。
In the technology reform of Dongjiang Pumping Station, a large scale axial -flow pump with double speed is used to fitting in with the nature of the pump head varying greatly.
東江泵站結(jié)郃敭程變化幅度大的特點，在技術改造中採用雙速全調(diào)節(jié)葉片的大型軸流泵機組型式，取得了明顯的節(jié)能傚益。