根的�地性,茎的背地性 原因是由于重力的作用,使a点生长素含量 b点,c点 生长素含量 D点;而根对生长素 ,茎对生长素 ,因而a点生长速度 Template




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tomski根的�地性,茎的背地性 原因是由于重力的作用,使a点生长素含量 b点,c点 coloring