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| 克氏氮用克氏方法测岀的蛋白质氮 | |||
| 凯氏氮; 总有机氮 | |||
| 克耶达定氮量 | |||
| Kjeldahl nitrogen: 12 phrases in 3 subjects |
| Earth sciences | 2 |
| Technology | 4 |
| Water resources | 6 |
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