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| proton number; atomic number | |||
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质子 数 : 21 phrases in 12 subjects |
| Business | 1 |
| Chemistry | 2 |
| Construction | 1 |
| Earth sciences | 1 |
| Electronics | 1 |
| General | 3 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Oil processing plants | 1 |
| Physics | 2 |
| Space | 1 |
| Technology | 6 |
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