地球内部的结构人类无法直接观察到目前为止主要来自对地震波的研究据此回答问题1在地下2900km处纵波的传播速度突然下降横波完全 Template




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tomski地球内部的结构人类无法直接观察到目前为止主要来自对地震波的研究据此回答问题1在地下2900km处纵波的传播速度突然下降横波完全 coloring