板材四面折边单元
sheet metal four edge folding cell
波陈面折叠干涉仪
wave-front folding interferometer
差动式折射计
differential refractometer
单层折面空间网格
single triangular gridding by folding method
单层折面空间网格结构
single-layer folded-plane spatial reticulated structure
single-layer folded-plane latticed shell structure
单层折面网格
single folded surface grid
单层折面网壳结构
single-layer folded-plane reticulated shell
单球面折射
refraction at a simple spherical surface