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When TCP transmits data, the data will first exist in the receiving buffer. The size of the buffer is indicated by the TCP window. If the window size is set to 0, it means that the buffer has been filled up. The sending end should stop sending data until the receiving end window is updated. Sockstress uses this principle to maintain the TCP connection for a long time to achieve the purpose of denial of service.(7) Having engaged in at least 20 maintenance and testing activities of fire fighting facilities for industrial buildings and civil buildings with a single building area of more than 20,000 square meters equipped with automatic fire fighting facilities in the three years prior to the date of application;果然香荽妹妹就是聪明，她忍一忍还是值得的。英布不及时接管江东也就罢了，彭城危急也不前来救援，这样的人留着说不定哪一天会出乱子。The "deliberate practice" introduced in this book is based on purposeful practice, but on top of this, there is more emphasis.