圆孔蜂窝钢梁
the circular hole castellated beams
圆孔蜂窝组合梁
circular hole castellated composite beams
圆孔夫琅禾费衍射
circular aperture Fraunhofer diffraction
圆孔夫琅和费衍射
Circular Hole Fraunhofer diffraction
fraunhofer diffraction for circle aperture
圆孔及平针组织绣花机
hole and flat-stitch embroidering machine
圆孔金属板
perforated metallic plate
圆孔轮切式拉刀
circular aperture rotula-cut broach-cutter