下载APP
【多选题】
防范系统攻击的措施包括（）。
A.
关闭不常用的端口和服务
B.
系统登录口令设置不能太简单
C.
定期更新系统或打补丁
D.
安装防火墙
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Thanks to the GPS, the apps on your phone have long been able to determine your general location. But what if they could do so with enough precision that a supermarket, say, could tempt you with digit...
A.
rewards programs
B.
physical stores
C.
profitable insight
D.
shopping habits