| |||
| 采用立井、斜井、平碉等任何两种或两种以上的井田开拓方式 | |||
| 联合开拓 | |||
|
combined development : 4 phrases in 4 subjects |
| Economics | 1 |
| Information technology | 1 |
| Oceanography & oceanology | 1 |
| Technology | 1 |
| |||
| 采用立井、斜井、平碉等任何两种或两种以上的井田开拓方式 | |||
| 联合开拓 | |||
|
combined development : 4 phrases in 4 subjects |
| Economics | 1 |
| Information technology | 1 |
| Oceanography & oceanology | 1 |
| Technology | 1 |