短語(yǔ)詞組短語(yǔ)effective circulating head 有效循環(huán)壓頭effective e head 凈落差;有效水頭effective pressure head [油氣]有效壓頭effective net head 有效凈水頭effective water head 作用水頭net effective head 凈有效水頭normal effective head 正常有效落差equivalent effective head 當(dāng)量有效水頭Head effective 有效水頭 返回 effective head