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通常嵌入式文件系统不具有(31)功能。

  • A.提供建立、修改、改变和删除目录等服务
  • B.提供创建、打开、读写、关闭和撤销文件等服务
  • C.提供对文件的加密和解密功能
  • D.设置、修改对文件和目录的存取权限
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