倒U型结构 inverted U-shaped structure

u型槽结构 u-type trough structure

预应力U型薄壁结构 prestressed U-thin-shell structure

U型组织结构 united organization structure

U型薄壁结构 U-type thin wall structure

型金氧半导体结构U型槽 VMOSstructureU-grooveV