【单选题】【消耗次数：1】
（）是数字货币最重要的技术手段。
①
区块链
②
金融
③
网络
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电子商务是指所有利用包括电讯、数字、磁力、无线、光学、电磁技术等电子技术手段和信息技术进行的（ ）的统称。
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交易活动和商贸活动
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服务活动
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以上都正确
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