double-channel Mossbauer spectrometer 双通道穆斯堡尔光谱仪

double-channel nitrogen laser 双通道氮激光器

double-channel planar buried heterostructure laser 双通道板状掩埋式异质结构激光器

double-channel super-short-wave wireless telephone 双工超短波无线电话机

double-check snow plough 双侧板式雪犁

double-check valve 双止回阀

double-coated electrode 双层药皮焊条

double-coated paper 双层涂料纸

double-colour plastic extruder 双色塑料挤出机

double-column hand-operated hydraulic press 双柱手动液压机

double-column hydraulic planer 双柱液压刨床

double-compound engine 双联双胀式蒸汽机

double-compound turbo jet 双轴涡轮喷气发动机

double-cone antenna 双锥形天线

double-cone blender 双锥体混合机

double-cone clutch 双锥离合器

double-cone coiler 双锥式卷取机

double-connected rectifier 双重连接整流器

double-crank mill 双曲轴轧机

double-crank press 双曲轴压力机

double-crank shaft engine 双曲轴发动机

double-crank shaft 双曲轴