下面所示鸟的结构图请据图说明鸟类适于飞行的特点1图1表示鸟的外形是 型 2图2表示鸟的前肢形成了 3图3表示鸟的胸肌 Template




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tomski下面所示鸟的结构图请据图说明鸟类适于飞行的特点1图1表示鸟的外形是 型 2图2表示鸟的前肢形成了 coloring