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| 最佳度效率 | |||
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efficiency optimum : 11 phrases in 9 subjects |
| Economy | 2 |
| Geophysics | 1 |
| Hydroelectric power stations | 1 |
| Management | 1 |
| Oil / petroleum | 1 |
| Shipbuilding | 2 |
| Space | 1 |
| Technology | 1 |
| Wind Energy | 1 |
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