为研究植物体内有机物的运输某同学做了如下实验�选取两枝带有较多不定根和叶的枝条.�用刀片对其中一枝进行�皮环割处理.环割部位离不定根的距离 Template




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tomski为研究植物体内有机物的运输某同学做了如下实验�选取两枝带有较多不定根和叶的枝条.�用刀片对其中一枝进行�皮环割处理.环割部位离不定根的距离 coloring