2．在网络操作系统的层次式结构中，位于文件管理层之下的是-湖北继续教育网网校

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[单选题]2．在网络操作系统的层次式结构中，位于文件管理层之下的是

A.应用程序

B.存储管理

C.硬件

D.进程间通信

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