单项选择题
A.21% B.20% C.19% D.18% E.17%
A.生长速度快 B.抗逆性差 C.饲料利用率高 D.饲养周期短 E.饲养密度大
A.10% B.15% C.20% D.25% E.30%
A.40% B.50% C.60% D.70% E.80%
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