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| 设计使用年期 | |||
| 设计期指设计使用的时间 | |||
| 设计年限 | |||
| 设计期限; 设计进度 (表) | |||
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period of design : 4 phrases in 2 subjects |
| Hydroelectric power stations | 2 |
| Technology | 2 |
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