13.下图为家鸽的�吸系统结构示意图 1上图�所示的结构是 �所示的结构是 2当家鸽飞行时每�吸一次气体两次经过图中数字 Template




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tomski13.下图为家鸽的�吸系统结构示意图 1上图�所示的结构是 �所示的结构是 coloring