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| relative efficiency of a sample design; power efficiency | |||
| apparent efficiency; apparent output | |||
| relative efficiency; power efficiency (of a test) | |||
| eficiencia relativa: 12 phrases in 7 subjects |
| Earth sciences | 1 |
| Electronics | 2 |
| Energy industry | 1 |
| Lighting other than cinema | 1 |
| Mathematics | 2 |
| Sound recording | 1 |
| Statistics | 4 |
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