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| 氧〔气〕指数 | |||
| 氧指数 | |||
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| 氧指数 | |||
| 氧指数〈塑料烧燃性〉 | |||
| 需氧指数 | |||
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oxygen-index : 20 phrases in 8 subjects |
| Earth sciences | 2 |
| Oil / petroleum | 1 |
| Oil processing plants | 3 |
| Plastics | 4 |
| Polymers | 2 |
| Technology | 3 |
| Textile industry | 4 |
| Water resources | 1 |
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