单项选择题
A.1~3cmB.5~6cmC.10~15cmD.15~20cmE.20~25cm
A.8~10%B.10~25%C.34%D.5~10%E.3~7%
A.翻肛鉴别B.快慢羽鉴别C.羽色鉴别D.伴性遗传鉴别E.外貌鉴别
A.5%~6%B.7%~8%C.9%~10%D.10%~12%E.12%~14%
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