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种子植物的形态结构


8.3.5 落叶和离层 落叶现象 落叶机理
8.3.6 叶的主要功能 1. 光合作用 2. 蒸腾作用
8.4 营养器官间的相互联系
8.4.1 茎与叶的维管束的联系
8.4.2 茎与根的维管束的联系
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