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| content of K 4 radioactive | |||
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| potassium content | |||
| content of potassium | |||
| 钾 4 含量: 15 phrases in 6 subjects |
| Agriculture | 2 |
| Ecology | 1 |
| General | 1 |
| Geophysics | 1 |
| Oil / petroleum | 3 |
| Technology | 7 |
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