氮气循环钻井
circular nitrogen drilling
逆循环
countercurrent circulation
reversal circulation
counter current circulation
reverse circulation
reverse cycle
counter revolution
逆循环阀
reverse circulating valve
逆循环椭圆力
backward elliptical vibrating forces
逆循环蒸发罐
reversed-circulation evaporaton
强制逆循环
backward forced-circulation
循环逆流浸出
circular countercurrent leaching
左肺逆循环
Reversal of left pulmonary Circulation
闭环循环冷却水系统
closed circulate cooling water system