单项选择题
A.25%-35% B.15%-20% C.25%-30% D.35%-40%
A.18-34g B.200-350g C.4-6g D.8-12g
A.胚芽鞘 B.子叶 C.盾片 D.真叶
A.1℃~2℃ B.5℃~10℃ C.15℃~20℃ D.25℃~30℃
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