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all in/all out（全进全出制）

时间：2021-12-31 20:12 关键词：动物学综合练习

答案解析

<p> 一批猪从猪舍出来后，栏舍经彻底清洁后空栏数天再重新引入新猪群的饲养方式。</p>

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