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2. No information is required for "online extension". Click to enter:If I were to implement a pizza ordering system, I would definitely write the code like this, because this kind of code can be written subconsciously without consuming our brains. However, take a closer look at this code: the purpose of this method is to order pizza. However, the code for ordering pizza also needs knowledge about the production of pizza. This method must know all pizza. Worse still, if the types of pizza are to be expanded or pizza with poor sales volume are to be deleted in the future, then the code for ordering pizza will be modified. It looks very bad and should be revised. Our first step must be to separate the code for producing Pizza from the code for ordering pizza, because you should not let the code for ordering Pizza know the logic for producing pizza, but should hand over the logic for producing Pizza to a special type. In this way, we can cope with future changes-if we want to add or delete pizza, we can directly modify the producer of pizza without affecting the logic of ordering pizza.This paper summarizes three attack technologies against artificial intelligence systems-antagonistic input, data poisoning attack and model stealing technology. Specific examples and defense strategies are added to the discussion of each attack, aiming at providing an overview for all those who are interested in using artificial intelligence for anti-abuse defense.The main rules of the competition are:作为前港姐冠军兼国际中华小姐冠军的陈晓华，去年尚未卸任便获安排拍剧，且获得第二女主角，足见TVB对她的重视程度，剧中jijikb.com陈晓华有不少动作戏，她坚持亲身上阵。除《迷网》之外，陈晓华还接拍了《食脑丧B》以及《七公主》，对于只读了为期两个月的电视艺员训练班的她来讲，无线似乎信心十足。