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For this reason, we can encapsulate a global publish-subscribe mode object. The following code:If an attacker sends a large number of SYN requests with fake source addresses, the server side will consume a lot of resources to handle this semi-connection, and saving traversal will consume a lot of CPU time and memory, not to mention retrying SYN + ACK on IP in this list. TCP is a reliable protocol, and messages will be retransmitted at this time. The default number of retries is 5. The interval time of retries is doubled from 1s to 1s + 2s + 4s + 8s + 16s = 31s respectively. After the fifth time is sent out, it will take 32s to know that the fifth time has timed out, so the total is 31 + 32=63s.三更求订阅********二舅奶奶听得头发昏，再也不想跟小葱掰扯了，丢开想要只人参的心思，反倒轻松起来。4. Use vinegar to remove peculiar smell? For a while? Need a car, need a place? This method can be adopted for a period of time.　　七十年后，其后人龙剑生（关礼杰）长大成人虽对武功一窍不通，但凭其聪颖机灵，亦能混迹江湖，大开杀戒并公然挑战五大派，企图称霸武林。五大派误认生为凶手。加以追捕，而真正之凶手火云邪神（刘家辉）为了得到“如来神掌”第九式“万佛朝宗”的秘笈，亦对生加以追杀。赵得柱已经彻底惊住了。