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便携式 pH计 : 45 phrases in 12 subjects |
| Agriculture | 6 |
| Automobiles | 1 |
| Aviation | 2 |
| Cryptography | 1 |
| Earth sciences | 3 |
| Economy | 1 |
| Electronics | 3 |
| Information technology | 2 |
| Oil / petroleum | 1 |
| Polymers | 1 |
| Sports | 1 |
| Technology | 23 |
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