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| 头部滚筒 | |||
| 磁头鼓 | |||
| head drum: 30 phrases in 11 subjects |
| Chemistry | 2 |
| Drilling | 1 |
| Electric machinery | 1 |
| Electronics | 4 |
| General | 6 |
| Information technology | 1 |
| Mathematics | 3 |
| Nautical | 1 |
| Otorhinolaryngology | 1 |
| Shipbuilding | 2 |
| Technology | 8 |
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