1 Taper Hole in Coupling
a circular hole with two cracks
a half plane with a hole
a hole in an implement or utensil for something to be inserted into
a pillar lens with a hole
a round peg in a square hole
A shrinkage method combining with medium-length hole and shallow hole
a square - hole obstacle
a square peg in a round hole
Access Hole
取数孔
进出孔
存取孔
检视孔
出入孔检修孔
工艺孔
出入孔
人孔
进入孔
出入孔检修孔人孔
甲板工艺孔
检修孔
检查孔
入孔
acid treatment of a bore hole
adsorption the seed hole