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【简答题】
写出下列数字的基数词和序数词形式。 3: 基数词________ 序数词_____ 9:基数词________ 序数词_____ 12:基数词________ 序数词_____ 21:基数词________ 序数词_____ 30:基数词________ 序数词_____ 17:基数词________ 序数词_____ 35:基数词________ 序数词_____
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