双管双层分采完成井 two-tubing dual completion well

双套管双套环 union thimble

双维管束双囊粉型 [古生] diploxylonoid

双筒双管吸管 double-barrelled and tubed pipette

双管双正激变换 Two transistor two forward converter

双管双变压直流变换器 double mosfet double transformer converter