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介绍了国内外聚碳酸酯合金的开发情况,并对国内研究机构提出了要求.
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关于课外活动, 每个人都需要纾发情绪的出口,消除日常工作的烦累.
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Three Methods: Were applied to research the estrus and ovulation induction of sows.
采用三种处理方法对母猪进行了诱导发情及排卵研究.
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However, the lev-els of MP _ 4 in the estrous period were high, and the quality of embryos was bad.
而在发情日, MP_4含量高, 则胚胎质量差.
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Estrus recurs at intervals of approximately six months until late in life.
从一个发情期至第二个发情期之间约为六个月.
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Many females return to a mini-cycle several times while weaning kittens.
一些母猫在给小猫断奶的时候会出现几次小的发情期.
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