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9-4 Number of diners: In the program written to complete Exercise 9-1, add an attribute named number_served and set its default value to 0. Create an instance named restaurant from this class; Print how many people have eaten in this restaurant, then modify this value and print it again. ?The combustion process of garbage incineration is essentially a complex process combining physical and chemical reactions such as mass transfer, heat transfer, momentum transfer, chemical reaction and structural change. Among them, the utilization of waste heat from garbage incineration has become a common concern. There are three main ways of utilization: power generation, heat supply and cogeneration. Affected by renewable energy in our country, the vast majority of waste heat from garbage incineration is used for power generation, and a few are used for heat supply or cogeneration.以「如果可以通过胎儿基因检测是否为精神病患者，肚子里的孩子被确认是患者，您是否会选择生下来？」为主题所展开的故事。将不同于以往精神病题材的电视剧。一个是刁蛮的明朝公主，一个是清朝深宫里的风流皇帝，一个是流放边疆的藩王之子。由他们撞击出来的友情火花，继而燃点出一个凄美的爱情故事，及一段崎岖的人生。A2.1. 2 Anthropometry.“超短篇”之神星新一。跨越世代被喜爱的魅力，是“宇宙”“机器人”“恶魔”等不可思议的令人兴奋的SF和幻想的要素。还有对人类和社会的“可笑”和“讽刺”混杂的视线。而且最重要的是，虽然很短，却让人吃惊的不可预测的故事。这是含有毒素的寓言，还是对人类的警钟。@哦撸马（阿点）