内六角圆柱头螺钉
hexagon socket head cap head screw
圆柱头内六角螺钉
hexagonal socket head cap screw
Al2O3基多角柱状陶瓷复合材料
alumina-based prismatic ceramic composites
厂房角柱
corner column of mill building
独立角柱
independent corner column
断经自停架角柱
angle block for warp stop box
二面角角反射体
Dihedral corner reflector
复二复三角柱
ditrigonal prism of the second order