double zone gas producer 两段煤气发生炉

double zone lotion 双层化妆水

double-8mm movie camera 双八毫米活动摄影机

double-acting air compressor 双动式空气压缩机

double-acting brushing machine 双动式刷呢机

double-acting compressor 双作用式压缩机

double-acting cylinder 双作用汽缸

double-acting duplex slush pump 双动双工泥浆泵

double-acting engine 双作用式发动机

double-acting hand force pump 双作用手摇泵

double-acting hinge 双面铰链

double-acting jack 双作用千斤顶

double-acting napping machine 双动起毛机

double-acting paddle impeller 双动搅拌桨

double-acting piston pump 双作用式活塞泵

double-acting pump 双作用泵

double-acting raising machine 顺逆交替起绒机

double-acting stream hammer 双动气锤

double-action black japanned spring hinge 黑漆双弹簧铰链

double-action disc harrow 双排式圆盘耙

double-action gin 双动式轧棉机

double-action hydraulic drawing press for sheet metal 双动薄板拉伸液压机

double-action hydraulic drawing press 双动薄板拉伸液压机

double-action hydraulic press 双作用液压机

double-action press 双动压力机

double-alloy steel 二元合金钢

double-amplitude modulation multiplier 双调幅乘法器

double-angle iron 双角铁

double-arm bridge 双臂电桥

double-arm kneader 双臂捏和机

double-arm mill 双臂压机

double-arm press 双臂压力机

double-armature motor 双电枢电动机

double-articulated reductor 二级链式减速器

double-axe cleavager 双斧劈木机

double-axis motor 双轴电动机

double-axle lathe 双轴车床

double-axle platform trailer 双轴平板拖车

double-base junction diode 双基极结型二极管

double-base propellant 双基推进剂

double-base transistor 双基极晶体管

double-beam amplifier tube 双电子束放大管

double-beam bridge type crane 双架桥式起重机

double-beam bridge type grab crane 双架桥式抓斗起重机

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

double-beam crane 双梁吊车

double-beam densitometer 双光束密度计

double-beam grating spectrophotometer 双光束光栅分光光度计

double-beam oscilloscope 双线示波器

double-beam spectrodensitometer 双光束分光光密度计

double-beam storage oscilloscope 双束存储示波器

double-beat converter 双拍变换器

double-beat dropvalve 双座阀

double-beat magnetic amplifier 双拍磁放大器

double-beat valve 双座阀

double-bended glass 双弯曲玻璃

double-bladed knife switch 双闸刀开关

double-bladed plough 双铧犁

double-bonded hydrocarbon 双键烃

double-boom jumbo 双臂钻车

double-boom plane 双尾撑飞机

double-bowl vacuum centrifuge 双鼓真空离心机

double-break push button 双断按钮

double-break switch 双断开关

double-breasted coachman-effect robe 双挂钮马夫式长袍

double-breasted cotton broadcloth frock with gold-tone buttons and belt 双排钮阔幅棉布外长衣配金色钮及金色腰带

double-breasted pinwale corduroy topper 双排钮条纹绒布短大衣

double-breasted plough 双壁开沟犁

double-breasted shark-skin suit 双排钮鲨鱼皮西装

double-breasted suit 双排钮上装

double-breasted white tuxedo 双排钮白色晚宴服

double-bus 双层公共汽车

double-buttoned pyramid coat 角锥形双钮大衣

double-cable ropeway 双缆索道

double-cable suspension line 双缆索道

double-case vertical centrifugal oil pump 双壳体立式离心油泵

double-chain draw bench 双链式拉拔机

double-chain stitch  machine 双链线迹缝纫机

double-chamber oil quenching-gas cooling furnace 双室油淬气冷炉

double-chamber vacuum packing machine 双室真空包装机

double-channel adjustable spanner 双道可调扳手

double-channel digital low-frequency spectrum analyzer 双通道数字式低频频谱分析仪

double-channel echo well depth sounder 双通道回声井深测试仪

double-channel echo well sounder 双通道回声井深测试仪

double-channel impeller pump 双路叶轮泵

double-channel instantaneous signal recorder 双通道瞬态信号记录仪