人的表皮细胞与外界环境的物质交换是 A 直接交换 B 间接交换 C 通过内环境进行交换 D 通过体液进行交换——青夏教育精英家教�—— Template




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tomski人的表皮细胞与外界环境的物质交换是 a 直接交换 coloring