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| 碳氢比 | |||
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| 碳氢比 | |||
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| 碳氢比 | |||
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carbon hydrogen ratio : 11 phrases in 6 subjects |
| Chemistry | 1 |
| Electronics | 1 |
| Geology | 1 |
| Oil / petroleum | 1 |
| Oil processing plants | 1 |
| Technology | 6 |
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