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| 主燃区 | |||
| 原生带; 一次燃烧室 | |||
| English thesaurus | |||
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| PZ | |||
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primary zone : 10 phrases in 5 subjects |
| Engineering geology | 1 |
| Geophysics | 1 |
| Metallurgy | 2 |
| Technology | 5 |
| Telecommunications | 1 |
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