如图为人体内两种重要化合物a与b的化学组成关系下列有关叙述正确的是 A.a的种类约有20种b的种类有8种b.图中b是人的主要的遗传物质 Template




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tomski如图为人体内两种重要化合物a与b的化学组成关系下列有关叙述正确的是 a.a的种类约有20种b的种类有8种b.图中b是人的主要的遗传物质 coloring