单面涂层双层纸板
one-side coated duplex board
低定量双胶纸
light weight offset paper
生铀层双层结构
Uranium-bearing double—layer structure
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
双层纸基摩擦材料
two-ply paper-based friction material