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| hill curve; hill diagram | |||
| efficiency curve | |||
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效率 曲线 : 31 phrases in 12 subjects |
| Agriculture | 1 |
| Business | 4 |
| Earth sciences | 1 |
| Economy | 1 |
| Electric machinery | 5 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 1 |
| Refrigeration | 2 |
| Solar power | 1 |
| Statistics | 2 |
| Technology | 11 |
| Wind Energy | 1 |
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