 |
| |||
| 磁道保有 | |||
| 磁道挂起; 磁道保持 | |||
| 磁道占有; 跟踪保持 | |||
| track hold: 16 phrases in 7 subjects |
| Aviation | 1 |
| Communications | 1 |
| Electronics | 3 |
| Information technology | 3 |
| Mathematics | 3 |
| Space | 1 |
| Technology | 4 |
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