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| 氢系统 | |||
| 氢气系统 | |||
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hydrogen system : 35 phrases in 10 subjects |
| Aviation | 5 |
| Business | 1 |
| Electric machinery | 5 |
| Electronics | 2 |
| General | 1 |
| Geophysics | 1 |
| Nuclear and fusion power | 4 |
| Oil / petroleum | 1 |
| Space | 8 |
| Technology | 7 |
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