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| 分离级: 71 phrases in 14 subjects |
| Aviation | 1 |
| Biology | 2 |
| Chemistry | 3 |
| Electronics | 4 |
| General | 16 |
| Mathematics | 1 |
| Military | 1 |
| Mining | 1 |
| Missiles | 9 |
| Oil / petroleum | 1 |
| Oil and gas technology | 1 |
| Oil processing plants | 4 |
| Oilfields | 1 |
| Technology | 26 |
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