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| 同步电路 | |||
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lock circuit : 26 phrases in 10 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| Construction | 1 |
| Electric machinery | 4 |
| Electronics | 4 |
| General | 1 |
| Oil / petroleum | 2 |
| Space | 6 |
| Technology | 4 |
| Telecommunications | 2 |
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