下列哪项不是鸟类的特征 A.体温恒定b.膈将体腔分成胸腔和腹腔c.体表覆盖羽毛d.体内有气囊 题目和参考答案——青夏教育精英家教�—— Template




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tomski下列哪项不是鸟类的特征 a.体温恒定b.膈将体腔分成胸腔和腹腔c.体表覆盖羽毛d.体内有气囊 题目和参考答案——青夏教育精英家教�—— coloring