12.血液和组织细胞之间进行氧气和二氧化碳的交换过程称为组织换气这个气体交换过程是通过气体扩散作用实现的.——青夏教育精英家教�—— Template




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tomski12.血液和组织细胞之间进行氧气和二氧化碳的交换过程称为组织换气这个气体交换过程是通过气体扩散作用实现的.——青夏教育精英家教�—— coloring