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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.Other requirements for kindergarten teacher qualification certificate:A low temperature stop valve, Unlike Example 1, Comprises a valve body 1 and a valve cover 2, A valve stem 3 is arrange in that valve body 1, One end of the valve stem 3 is provided with a valve disc 4, The other end of the valve stem 3 is provided with an adjusting handwheel 5, A low portion of that disc 4 is provided with a guide sleeve 6, The guide sleeve 6 is fixed by means of a connecting piece and a spring pad 8, Between that disc 4 and the guide sleeve 6 is provide a valve seat 7, Between that valve stem 3 and the valve cov 2 there is provided a packing assembly 9, The O-ring 10 is further arranged at the upper part of the packing assembly 9, the upper part of the O-ring 10 is provided with a packing gland 11, the valve body 1 is provided with an arc-shaped end face 12, the arc-shaped end face 12 forms a line seal between the valve body 1 and the valve seat 7, the contact end of the valve disc 4 and the valve seat 7 is provided with a water grain surface 41, the packing assembly 9 comprises a flexible graphite packing layer, and the valve body 1 is provided with a liquid inlet cavity and a liquid outlet cavity.　　这正是三军军长李兆麟在面临危机时刻与耿殿军秘定，利用关东军警事厅厅长渡边正雄提出的“只打抗联，不打土匪”的诡计，从三军中挑选了十二名身怀绝招的抗联战士假扮土匪抗日，报号“十三省”。“省”字即意为“省悟和觉悟”。The first scheme is to use the general coding method to realize the preloading technology of the picture. First, create the imgNode element, Then when the method myImage.setSrc is called, a preloaded picture is given to the picture first, and when the picture is loaded, the img element is assigned a value. The second scheme is implemented by using proxy mode. MyImage function is only responsible for creating img elements, proxy function ProxyImage is responsible for setting loading pictures for the picture, and when the picture is really loaded, myImage.setSrc method in myImage is called to set the path of the picture. The advantages and disadvantages between them are as follows:故事发生以明朝正德年间，陕西省宝鸡府凤翔县。世袭指挥秦昆鹏的母亲给孙玉凤送去一只玉镯，孙玉凤回赠一幅荷花图，两家定亲。尤彩凤的舅父母褚生和贾氏夜宿尤家，双双被害，贾氏人头也不知去向。尚朝奉夜拾包袱，见是女人头颅，丢入朱砂井中。他害怕伙计孙玉秀报官，将他推入井中害死。第二天到县衙告状，谎说孙玉秀偷银窃物后逃走。县令钱树于受书吏任义操纵，判孙玉秀的父亲孙国安赔偿，孙国安不服，被押进监牢。孙玉凤父亲被押，上堂辩理，钱树青说她无理取闹，将她押在狱中。女牢中，龙彩凤细说原委，秦昆鹏的未婚妻孙玉凤见此案有冤，决心去府衙伸诉。知府宁信到县复审，任义买通府衙女仵作水蜜桃，诬险尤彩凤失节，宁信误信，错判尤彩凤、秦昆鹏通奸杀人罪名成立。孙玉凤不服，到省上告。按察院陈思三复审，女仵兰彩华巧妙地破坏了尤彩凤的尿样，又误验尤彩凤为孕妇，使尤彩凤、秦昆鹏奇冤难雪。发审官杜重仁见此案不实，便乔装私访，弄清了真相，并从朱砂井中捞出贾氏人头与孙玉秀尸身，将尚朝奉、胡媒婆、胡大楞缉拿归案。周浩点头道：徐宣兄此言有理，是该如此。