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| comparison measurer | |||
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| pH value comparator | |||
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比值 器 : 16 phrases in 8 subjects |
| Chemistry | 1 |
| Electronics | 6 |
| Geophysics | 1 |
| Metallurgy | 1 |
| Oil processing plants | 1 |
| Refrigeration | 1 |
| Space | 1 |
| Technology | 4 |
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