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Int result = cal.calate (exp);IV. Application Value of BIM Technology in Operation and Maintenance嗷——打人不打脸。小尼古拉（马克西姆·戈达尔 Maxime Godart 饰）深受父母宠爱，在学校也与一帮朋友玩得开心，这其中包括：想当大官的亚斯特Alceste（Vincent Claude 饰）、以后会继承父业的杰夫Geoffroy（Charles Vaillant 饰）、梦想成为自行车冠军在班上却总是被罚站的克劳岱Clotaire（Victor Carles 饰）、长大要当黑道的奥德Eudes（Benjamin Averty 饰）、希望跟老爸一样成为警察的鲁夫Rufus（Germain Petit Damico该剧讲述了家装设计师杨光与陈曦联手为客户打造理想的新居，体味人间百态，寻找家与幸福真谛的故事。From the perspective of service, DDoS protection is essentially a war in which users are the main body and rely on anti-D protection systems to compete with hackers. In the whole process of data confrontation, service providers often have absolute initiative. Users can base on specific rules of anti-D system, such as traffic type, request frequency, packet characteristics, delay interval between normal services, etc. Based on these rules, users can better resist DDoS of the seven-layer class and reduce the resource overhead of the server on the premise of satisfying the normal service itself. The detailed schematic diagram is as follows: