以下哪项措施不能有效提高系统的病毒防治能力？（）
- A.安装、升级杀毒软件
- B.下载安装系统补丁
- C.定期备份数据文件
- D.不要轻易打开来历不明的邮件
正确答案及解析
正确答案
解析
安装、升级杀毒软件可以自动检测计算机中的病毒程序，下载安装系统补丁可以有效地封堵系统漏洞，不轻易打开来历不明的邮件可以有效地预防网络邮件病毒，这三项措施都可以提高系统的病毒防治能力。定期备份数据文件可以有效地保护数据的安全，但无法提高系统的病毒防治能力。
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