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| 成本效率比; 成本效益比率 | |||
| 成本效益效率比 | |||
| 成本效果比 | |||
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| 成本效益比; 费效比 | |||
| 费用效能比; 费用效果比 | |||
| cost effectiveness ratio: 3 phrases in 2 subjects |
| Hydroelectric power stations | 2 |
| Space | 1 |
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