串联压电双晶片
series piezoelectric bimorph
单面涂层双层纸板
one-side coated duplex board
螺旋状压电双晶片
spiral-belt piezoelectric bimorph
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