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| 燃油碳氢比 (ratio) | |||
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hydrogen /carbon : 33 phrases in 12 subjects |
| Automobiles | 4 |
| Aviation | 1 |
| Chemistry | 3 |
| Earth sciences | 2 |
| Electronics | 3 |
| Engineering geology | 1 |
| Geology | 3 |
| Geophysics | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 3 |
| Oil processing plants | 1 |
| Technology | 8 |
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