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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. ?打赏一千元，能获得十万粉丝值。•小望　往西邊去（中島朋子）1941年12月7日，一群从未梦想过辉煌的年轻人，轰炸了日本的心脏。影片讲述了他们的真实的故事。劳森中尉告别了有身孕的妻子爱伦，和他的战友们在秘密训练之后，开始了他们的真正行动，他们的飞机从航空母舰上起飞，沿海岸线低空飞行，准备抵达日本的上空，实施轰炸计划。在他们顺利完成任务后，他们的飞机出了故障，在迫降的时候，机体严重受损，飞行员也受了伤。中国沿海军民冒死营救他们，在日本兵扑来着前，将他们安全转移。在缺医少药的困境下，成功地实施了手术。当拖着残肢回国的劳森准备断绝与爱妻及友人的联系时，爱伦来到了他的房间，他们庆幸，得以与亲爱的人重逢是他们最大的幸福。"Do you mean that these 'dogs' that attacked position 142 are indeed some animals similar in appearance to common dogs?" I said.Publish-subscribe mode is also called observer mode. It defines a one-to-many relationship between objects, allowing multiple observer objects to monitor a topic object at the same time. When an object changes, all objects that depend on it will be notified.As a result, publicity and education should be stepped up. Environmental sanitation in rural areas needs to be greatly improved, and the scientific and cultural quality of farmers needs to be greatly improved. This may be a great challenge for our public health personnel to work in the future. I know very well that the burden on our shoulders is very heavy and there is still a long way to go! Therefore, at this moment, the school stage must fully learn relevant theoretical knowledge, fully arm one's mind, grasp the opportunities of social practice and school practice, and accumulate more experience. Only in this way can one make one's own contribution to the public health cause of our country, make our country more prosperous, and enable the people to live a healthy and happy life.