已知正项等比数列满足：，若存在两项使得，则的最小值为（

已知正项等比数列满足：，若存在两项使得，则的最小值为（）

A． B． C． D．不存在

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已知正项等比数列满足：，若存在两项使得，则的最小值为（

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