combined development
| method
| combined development abbr. | |
| expl. | 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 |
| method abbr. | |
| gen. | 法; 标准; 水平 |
| environ. | 方法 |
| hydroel.st. од. | 方法 |
| mech. | 电火花法 |
| |||
| 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 |