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【单选题】
在传统的信息系统中，计算机运行维护人员负责对软件和数据文件进行定期备份。在分布式系统或协作系统中，确定是否有足够备份的责任属于：A.
数据录入员。
B.
系统程序员。
C.
用户管理部门。
D.
磁带库管理员。
拍照语音搜题，微信中搜索"皮皮学"使用
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A.
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B.
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C.
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D.
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