未知题型
随着计算机应用范围的扩大，如何确保计算机的安全性显得日益重要。在常用的对文件进行安全性管理的措施中，(18)的主要任务是不允许未经核准的用户进入系统；(19)是通过系统管理员或文件主对文件属性的设置，来控制用户对文件访问。
- A.系统级安全管理
B．用户级安全管理
C．目录级安全管理
D．文件级安全管理
【参考答案】
A
解析：系统级安全管理主要是不允许未经核准的用户进入系统。
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