perforation
短语词组
- stercoral perforation 結腸糞性穿孔;糞性結腸穿孔
- abraded perforation 磨蝕的射孔眼
- Mixed Perforation 混郃齒孔
- Perforation Misplaced 齒孔移位
- Bald perforation 禿齒
- blocked perforation 堵塞的砲眼
- Short perforation 短齒
- undamaged perforation 無汙染射孔
- gun perforation 射孔;射孔完井
- perforation plate 穿孔板；勻漿板 返回 perforation