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当缺乏此维生素时,幼龄动物会出现骨骼变软,成年动物出现骨质疏松的...
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2500只10日龄雏鸡,约有30%的鸡只出现采食降低,精神不振,...
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Friday, September 16, 2022
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海拉明和异丙嗪的镇静催眠作用,主要是通过抑制何种组织而起作用。(...
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Friday, September 16, 2022
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Friday, September 30, 2022
有机磷中毒的机理是:它能抑制胆碱酯酶的活性,使乙酰胆碱在体内蓄积...
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一只1周龄羊羔,下痢黄色稀粪,偶见混有凝血乳小块,吃奶少,神乏无...
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