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离子 分子量 : 20 phrases in 9 subjects |
| Aviation | 1 |
| Chemistry | 2 |
| Earth sciences | 4 |
| Electronics | 4 |
| Geology | 2 |
| Metallurgy | 3 |
| Oil / petroleum | 1 |
| Space | 1 |
| Technology | 2 |
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