如图表示人的受精及胚胎�育过程请据图回答1a是 C是 它是人体�育的起点.2b是 它的主要作用是 .3d过程的场所在 Template




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tomski如图表示人的受精及胚胎�育过程请据图回答1a是 c是 它是人体�育的起点.2b是 coloring