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The most basic defense at the network layer is RFC? 2827 [3]. Using input source filtering, ISP refuses to route a packet whose source IP address does not belong to its source subnet further. Input source filtering can effectively prevent SYN flooding attacks disguised as IP. However, this method is useless at present because it is difficult to deploy on a large scale. Moreover, input source filtering cannot resist distributed attacks.刘氏听了流泪不止，能不想吗？她的第一个娃，是那么讨人喜的小葫芦，差点就没了。该剧以检察官为题材，讲述一宗跨越四十多年的复杂案件，建国以来三代检察官的生活、工作、家庭及成长经历，展现了检查机关在半个世纪里的艰难历程，讴歌了检查工作者的高尚情操和美好情感。八侍卫为了保护王继，维护国家的安定自愿受死，黑上太人控制朝中大局，朝中已经大乱，正在此时镇守边关的风侯带着十万兵马赶来， 风侯提出让他的儿子风继承王位！原来八侍卫早已被风侯所救。风是八侍卫之一，一直以来记忆都被惊魂钟封印，见到风侯后才被唤起之前所有的记忆，原来他是风侯的儿子，现在如果要立新君，风的王族血统显然比黑上太人更占优势。风住到皇宫，居然发现黑上太人女儿花之娥是自己失散多年的童年伙伴小轩，而英却发现风口中的小轩其实是自己……英向八侍卫其他成员说明情况，其他人的态度也开始变得奇怪起来，事情越发复杂，风侯、风、花之娥……他们的目的各自是什么，一切又陷入谜团。Conclusion: As long as there is this instance in the task, the page with singleTask set will be reused all the time, and every time the existing instance is reused, the other instances above (FirstActivity here) will be emptied, and the page will be directly promoted to the top of the stack, that is, it will display itself.