双阀管鞋    double valve shoe

双墙防波堤    double wall breakwater

双字    double word

双作用容积式压缩机    double-acting positive displacement compressor

双作用旋转震击器    double-acting rotary jar

双向弹簧    double-acting spring

双弧    double-arc

双筒分离器    double-barrel separator

双基火药    double-base powder

双束的    double-beam

双电子束阴极射线管    double-beam cathode-ray tube

双键烃类    double-bonded hydrocarbon

双字节字符集    double-byte character set

双壳流量计    double-case meter

双面药膜底片    double-coated film

双面X-射线底片    double-coated X-ray film

双牙轮钻头    double-cone bit

双缸比例泵    double-cylindered proportioning pump

倍和法    double-dabble

双盘浮顶    double-deck floating roof

双层泥浆振动筛    double-deck shale shaker

双密度记录    double-density recording

双偶极排列    double-dipole array

双滚筒绞车    double-drum rope winch

两用煤油    double-duty kerosene

两用设备    double-duty plant

双效蒸发器    double-effect evaporator

双头的    double-end

双端螺栓    double-end bolt

双头锅炉    double-ended boiler

双端装药爆炸筒    double-ended charge

双向端子    double-ended clamp

双头扳手    double-ended spanner

复式记帐法    double-entry bookkeeping system

双重断错背斜    double-faulted anticline

双卡瓦大内孔单管封隔器    double-grip large bore single string packer

龙门刨床    double-housing planer

双层船壳的油轮    double-hulled tanker

双象测距仪    double-image range-finder

双管焊接    double-jointing

双根钻杆    double-jointing pipe

双层吸附    double-layer adsorption