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| 不孕天数; 空怀天数指产仔后至再次妊娠间隔的天数 | |||
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| 不孕天数; 空怀天数指产仔后至再次妊娠间隔的天数 | |||
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days open : 13 phrases in 8 subjects |
| Animal husbandry | 3 |
| Economy | 1 |
| General | 2 |
| Reproductive biology | 2 |
| Securities | 1 |
| Shipbuilding | 1 |
| Technology | 1 |
| Textile industry | 2 |
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