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"It can also be said that, but the premise is that there are only big wasps, but there are not only big wasps, so things are not so simple. If it were just big wasps, it would not be like what it was later." Zhang Xiaobo said.魔由心生，无比可怕。In TCP protocol, messages arriving at the destination will enter the buffer of the TCP stack and will not be forwarded to the receiving system until the buffer is full. This is to minimize the number of times the system empties the buffer. However, the sender can force the receiving system to clear the contents of the buffer by sending a TCP message with a PSH flag of 1. The TCP PUSH + ACK attack, like the TCP SYN attack, aims to deplete the resources of the victim system. When an attacker sends TCP messages with PSH and ACK flags set to 1 to the Target host, these messages will cause the Target system to clear all TCP buffers (whether the buffers are full or not) and respond with an acknowledgement message. If this process is performed by a large number of controlled hosts, the system will not be able to process normal data, resulting in denial of service.The USB handle may need to be driven.Baidu Encyclopedia tells us that tincture is "a clear liquid preparation made by extracting or dissolving raw materials with ethanol at a specified concentration". The European Pharmacopoeia stipulates that the extract can only be alcohol of appropriate concentration. The extract may come from plants or animals; The extraction method can be dipping or percolation-the difference between the two is that the extraction solution is static during dipping, while the extraction solution is constantly updated and flowing during percolation.