| |||
total depth | |||
overall depth | |||
overall depth (of section) |
总深度: 45 phrases in 11 subjects |
Bridge construction | 1 |
Drilling | 14 |
Earth sciences | 1 |
Engineering geology | 2 |
Explosives and Explosive Ordnance Disposal | 1 |
General | 1 |
Geophysics | 6 |
Mining | 4 |
Oil / petroleum | 6 |
Shipbuilding | 2 |
Technology | 7 |