【单选题】【消耗次数：1】
央行数字货币系统框架的核心要素为（）。
①
A.一币，两库，三中心
②
B.一币，一库，三中心
③
C.一币，两库，两中心
④
D.两币，两库，三中心
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在聚焦“一极两中心两地”的目标定位中，“两中心”指的是（）。
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