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| content (mol/kg) |
|||||
|---|---|---|---|---|---|
| coal sample | hydroxy | carboxy | carbonyl | ether bond | methyl |
| Kiamusze | 8.64 | 32.93 | 6.28 | 6.51 | 6.04 |
| Panxi | 8.81 | 29.93 | 5.45 | 5.80 | 5.33 |
| Haitian | 7.43 | 28.06 | 5.10 | 5.27 | 4.74 |
| Pingba | 8.75 | 29.93 | 4.98 | 5.45 | 5.45 |
| Pingbao | 6.66 | 26.19 | 4.27 | 4.51 | 3.80 |
| Ordos | 8.31 | 29.93 | 5.45 | 5.69 | 5.33 |
| Matigou | 7.98 | 28.81 | 5.57 | 5.80 | 4.98 |
| Zhaozhuang | 8.53 | 31.43 | 6.16 | 6.34 | 5.80 |
