| |||
| 钻头使用程序; 钻头设计方案 | |||
| 钻头程序 | |||
|
bit program : 7 phrases in 5 subjects |
| Drilling | 1 |
| Electronics | 1 |
| Hydroelectric power stations | 1 |
| Information technology | 1 |
| Oil / petroleum | 3 |
| |||
| 钻头使用程序; 钻头设计方案 | |||
| 钻头程序 | |||
|
bit program : 7 phrases in 5 subjects |
| Drilling | 1 |
| Electronics | 1 |
| Hydroelectric power stations | 1 |
| Information technology | 1 |
| Oil / petroleum | 3 |