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| 联锁系统 | |||
| 连锁系统 | |||
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interlocking system : 15 phrases in 7 subjects |
| Agriculture | 1 |
| Communications | 2 |
| General | 1 |
| Nautical | 1 |
| Rail transport | 2 |
| Space | 1 |
| Technology | 7 |
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