 |
| |||
| 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: 3 phrases in 3 subjects |
| Economy | 1 |
| Information technology | 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: 3 phrases in 3 subjects |
| Economy | 1 |
| Information technology | 1 |
| Technology | 1 |