单项选择题
A.1/2 B.1/3 C.1/4 D.1/5
A.干喂 B.湿喂 C.先干后湿 D.先湿后干
A.80% B.90% C.85% D.95%
A.4.0% B.3.0% C.3.5% D.4.5%
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