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| 低硫夫然气 | |||
| 低硫气; 净气 | |||
| 无硫夭然气; 无硫气; 脱硫气; 低硫天然气; 无硫气体; 无硫煤气 | |||
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sweet gas : 6 phrases in 2 subjects |
| Oil / petroleum | 4 |
| Technology | 2 |
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