枝条的环割实验说明有机物是通过 A.�皮的结构�上运输的 b.木质部的结构�上运输的 c.�皮的结构�下运输的 d.木质部的结构�下 Template




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tomski枝条的环割实验说明有机物是通过 a.�皮的结构�上运输的 b.木质部的结构�上运输的 coloring