双管双层分采完成井
two-tubing dual completion well
双管双管板换热器
double tube double tube-plate heat exchanger
单面涂层双层纸板
one-side coated duplex board
滚筒式双层筛砂机
cylinder double layer sand siftering machine
生铀层双层结构
Uranium-bearing double—layer structure
双层管单层连接管道
double-walled pipe with single-walled connection
双层管单接法
double-walled pipe with single-walled connection
双层双跨混凝土框架
double-story and double-span RC frame
双层双曲抛物面网格壳
hyperbolic parabolic double-deck reticulated shall
双层双扇形
double-layer twin fans shaping
双管双动岩芯管
double tube double swivel barrel
双管双正激变换
Two transistor two forward converter