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| variance of unit weight | |||
| 方差因子: 16 phrases in 9 subjects |
| Business | 4 |
| Desert science | 1 |
| Ecology | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Geophysics | 1 |
| Mathematics | 2 |
| Oil / petroleum | 1 |
| Technology | 4 |
| Telecommunications | 1 |
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