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