如图是家鸽的肺和气囊示意图请据图回答1从图中可以看出气囊与肺相通鸟类飞行时每�吸一次空气就 次经过 .在 内进行两次气体 Template




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tomski如图是家鸽的肺和气囊示意图请据图回答1从图中可以看出气囊与肺相通鸟类飞行时每�吸一次空气就 次经过 .在 coloring