工作 载荷 : 35 phrases in 13 subjects |
Aviation | 2 |
Bridge construction | 2 |
Chemistry | 1 |
Construction | 1 |
Drilling | 1 |
Electronics | 2 |
Engineering geology | 4 |
Hydroelectric power stations | 2 |
Nautical | 4 |
Oil processing plants | 1 |
Refrigeration | 1 |
Space | 2 |
Technology | 12 |