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进行网络攻击，一般分为三个阶段，按顺序，分别是攻击的__阶段、攻击的_阶段以及攻击的___阶段

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下面哪几个不是在攻击的准备阶段做的事情？

A. 确定攻击目的
B. 利用信息获取帐号密码，登录主机
C. 清除日志
D. 收集目标信息

通过ping命令返回的TTL值可以探测某个主机的操作系统类型，对应关系是

网络攻击的第二阶段，实施阶段，具体步骤按顺序为

Fill in the blanks with the proper word.(填写对应序号)1.I felt sorry for him and his colleagues – it must have been sofor them.2.Henry broke up with his girlfriend yesterday. We need tohis attention so that he won't get frustrated.3.Constantin bad habits brought about his ruin.4.Sometimes expensive drugs or other treatments can be economical.5.Theof nuclear weapons should be under control.