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To enter oneself for an examination in the flight college, one must first have two physical examinations 2 or 3 months before the college entrance examination. The first is the preliminary examination, which is generally divided into four major subjects: ophthalmology, otolaryngology, surgery and internal medicine. Applicants are generally required to check ophthalmology first, because ophthalmology has the highest elimination rate. Most applicants will be eliminated in this subject, and future subjects will not have to be checked. When I applied for the examination that year, there were 10 boys in the whole school. As a result, 7 boys were brushed off in the first round of ophthalmology. Ophthalmology mainly examines vision and fundus, requiring normal vision and free from myopia, hyperopia, trachoma and other diseases, as well as color blindness, color weakness and other defects. Pilots use a special "C" table to check their eyesight, with 8 directions. It is far more difficult than the "E" table.Intermediator mode: Pay attention to the interaction between encapsulated objects, and decouple by encapsulating the complex interaction between a series of objects so that they do not need to explicitly refer to each other.DNAT: Destination address translation.大伯父是个有风骨的人，一夜间老了许多。A TCP connection is a quad, and a connection is uniquely determined by the source IP, the source port, the destination IP and the destination port. Therefore, if C wants to forge the packet from A to B, it should fill in the above-mentioned IP header and TCP header with the source IP, source port, target IP and target port. Here B is the server, IP and port are open, A is the target we want to attack, IP certainly knows, but the source port of A is not clear, because it may be randomly generated by A. Of course, if we can find out the rule of generating source port for common OS such as Windows and Linux, we can still do it. In addition, we can step on the connection port of Car A through a large number of controlled hosts.信口开河的老东西，你才是无知的蠢材Updated October 8