小肠是消化食物和吸收养分的主要场所与这一功能相适应的结构特点主要表现在小肠是消化道 的部分小肠内表面有 和 扩大了消化和吸收的面积小肠 Template




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tomski小肠是消化食物和吸收养分的主要场所与这一功能相适应的结构特点主要表现在小肠是消化道 的部分小肠内表面有 和 coloring