| |||
straight hole | |||
perpendicular hole | |||
vertical cell; vertical core | |||
| |||
vertical hole; element handling pickup hole | |||
| |||
vertical hole |
垂直孔 : 35 phrases in 9 subjects |
Aviation | 1 |
Electronics | 2 |
Engineering geology | 3 |
Explosives and Explosive Ordnance Disposal | 12 |
General | 1 |
Oil / petroleum | 3 |
Rail transport | 1 |
Space | 2 |
Technology | 10 |