下列各项中能视为物质进出内环境的实例是 a受精过程中精子进入卵细胞内 b.牛奶被饮入胃中 C.氧气通过�吸运动进入肺泡里 D.静脉注射 Template




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tomski下列各项中能视为物质进出内环境的实例是 a受精过程中精子进入卵细胞内 b.牛奶被饮入胃中 coloring