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| hydrogen-ion index | |||
| hydrogen ion exponent | |||
| hydrogen ion index | |||
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氢离子指数 : 10 phrases in 6 subjects |
| Agriculture | 1 |
| Chemistry | 2 |
| Earth sciences | 1 |
| General | 1 |
| Refrigeration | 1 |
| Technology | 4 |
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