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(2) Equipment, facilities and necessary technical support conditions suitable for the business scope of fire safety assessment;Source: Imperial UnitWhen the server provides some UDP-based services, such as DNS, SMTP, NTP, etc., and finds some requests, in which the Response message is larger than the Request message, the Attacker sends a Request message that forges the source IP, and the source IP forges the IP address of the victim. After receiving the Request message, the server replies the "enlarged" Response message to the victim, thus realizing the amplification of traffic. The principle is roughly as follows:　　一天，向阳和向东因为邻居郎健的弟弟郎辉调戏美萍而与其大打出手，向阳失手将郎辉打死。心理非常脆弱的向阳面对意外情况惊慌失措，十分绝望，几乎走向自我毁灭的边缘，多亏向东及时救下了意欲自杀的向阳。美萍知道一切是由她引起的，她发誓说无论多久，都会一直等着向阳。不料，向东因为愁眉不展的父亲和为袒护哥哥，对前来调查的警察说其实把人致死的是他。美萍目瞪口呆，竟信以为真的以为是向东所为，但在心中的那份愧疚感更加深刻。可由于她爱着向阳，因此她只好和向阳的交往来弥补对赵家恩与过。父亲面对着代兄受过的向东，心如刀绞，他含着泪说："手心手背，都是父母的心头肉，伤了谁，爸爸的心里都疼。"向东获刑五年，出狱后好在如今时间尚短，他们心中的伟大志向，和拼搏精神都还在，并没有被消磨掉的。D > B enters the synchronized block, and since instance is not null at this time, it immediately leaves the synchronized block and returns the result to the program calling the method. E > At this point, thread B intends to use the Singleton instance, only to find that it has not been initialized, so an error occurs. Therefore, there is still the possibility of errors in the program. In fact, the running process of the program is very complicated. From this, we can see that it is more difficult and challenging to write programs especially in multi-threaded environment. We further optimized the program:那里还有苏角的五万精兵，或可稳住阵脚，图谋再战。