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| isotopic number | |||
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同 位数 : 39 phrases in 13 subjects |
| Agriculture | 1 |
| Business | 1 |
| Electronics | 2 |
| General | 1 |
| Geology | 1 |
| Geophysics | 1 |
| Mathematics | 2 |
| Metallurgy | 8 |
| Oil / petroleum | 1 |
| Physical sciences | 1 |
| Project management | 1 |
| Space | 1 |
| Technology | 18 |
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