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| mechanical timer (器) | |||
| 机械定时: 10 phrases in 9 subjects |
| Aviation | 1 |
| Electronics | 2 |
| General | 1 |
| Geophysics | 1 |
| Oil / petroleum | 1 |
| Oil processing plants | 1 |
| Project management | 1 |
| Space | 1 |
| Telecommunications | 1 |
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