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| 可用两种燃料的燃烧器 | |||
| 两用燃烧器 (可用两种燃料) | |||
| 可用二种燃料的双燃烧器; 双工质燃烧器 | |||
| 复式燃烧器 | |||
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dual burner : 6 phrases in 2 subjects |
| Oil / petroleum | 2 |
| Technology | 4 |
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