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再说方威，说自己运气好，不但玄龟嘲笑，众少年也都跟着嘲笑，说要这样算的话，大家运气都好，都没来得及娶媳妇。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.(2) Night shift, overtime as little as possibleNot only that, according to the intuitive feelings of the reporters of the NPC and CPPCC, the proportion of female reporters is far higher than that of men. In 2013, the number of reporters from Nanjing Metropolis Daily who went to Beijing was 11, and the ratio of men to women was miraculous 3: 8. Some people joked that the news war between the NPC and CPPCC used women as men.9-13 Use OrderedDict: In Exercise 6-4, you used a standard dictionary to represent the vocabulary. Please use the OrderedDict class to override this program and make sure that the order of output is the same as the order in which you add key-value pairs to the dictionary. ?The advantage is that the coupling between the sender and the receiver of the request is eliminated.