皮皮学，免费搜题
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【单选题】
在利用计算机进行数据处理的四个发展阶段中，第一个发展阶段是()。
A.
人工管理
B.
文件系统
C.
数据库系统
D.
分布式数据库系统
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
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