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(2) According to the voltage of the controlled circuit to select the voltage of the time relay suction winding.I. Chinese citizens who have not reached the national legal retirement age at the end of the year when they sign up, have the qualifications for teachers stipulated in the Teachers Law and are willing to work as teachers.这东西就能凝成凉膏了。章家的三朵花，一朵清香雅丽，一朵红艳脱俗，一朵最美最甜却最多刺，因上一代的恩怨，造成下一代的牵连纠结，最终酿成无法挽回的遗憾。在地下音乐界有点知名度的女生乐团两人组合“ハルレオ(harureo)”。Haru（門脇麦饰）和Reo（小松菜奈饰）两人为了各自发展，而决定解散。他们找来外援志摩（成田凌饰）一起做全国巡演。但是在路上Reo喜欢上志摩，志摩却喜欢上Haru。而其实Haru对Reo有着友情以上的感觉…。According to statistics, SYN attack is the most common and easily used attack method among all hacker attacks. I believe many people still remember the attack on YAHOO website in 2000. At that time, hackers used simple and effective SYN attacks. Some network worms cooperated with SYN attacks to cause greater damage. This paper introduces the basic principle, tools and detection methods of SYN attack, and comprehensively discusses the prevention technology of SYN attack.