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种猪常温精液
Boar fresh semen
参考页数:14
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猪常温精液生产与保存技术规范
Technical specification for production and preservation of fresh boar semen
参考页数:12
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饲养场内部设备 粪便连续刮板输送机
Equipment for internal farm work and husbandry; Continuous manure scraper conveyors for stalls
参考页数:2P.;A4
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