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| 分配系统; 配水系统; 配电系统 | |||
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distributing system : 18 phrases in 7 subjects |
| Aviation | 1 |
| Chemistry | 1 |
| Ecology | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 3 |
| Space | 3 |
| Technology | 7 |
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