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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. ?Intercept a section of network cable and burn it under the network cable with a lighter. If the outer skin of the network cable has flame resistance, the outer skin of the network cable will gradually melt and deform, but it will not burn, and generally there will be no black smoke. If the network cable is fake, or if the outer skin does not have flame resistance, the network cable will be lit in a short time when the lighter is used to burn, and black smoke will be generated and there will be a great taste. This kind of network cable obviously does not meet the safety standards.The second season of "Charming China City" has been upgraded completely, "Charming China City? The establishment of the" City Alliance "and the official launch of the" Charming Card "program mean that there is a broad prospect for the deep integration of culture and tourism, and the sustainable development of the city will also usher in a new breakthrough. CCTV's combination of boxing to help the poor through tourism shows the sense of responsibility and mission of the national big station.　　在这个热带城市，有着这样一个团队，他们严谨敬业，他们辛勤客观，他们由鉴证人员，验尸官，调查员等各方面的专家组成，出入各个案发现场，用锐利的眼神寻找蛛丝马迹，巧妙利用弹道学、犯罪危险因子学、法医毒理学、DNA鉴定、咬痕与血型分析、齿 、科学、昆虫学、痕迹学和犯罪变态心理学抽丝剥茧，将支离破碎的线索拼凑起来，还原出事实真相。岩清市公安局刑警队长程剑如的妻子向臻在一次车祸中意外死亡。在此之前，向臻正在调查天园集团的偷漏税事件，而发生车祸的当天也正是天园集团总经理胡俊清的弟弟胡俊奇被枪决的日子，胡俊奇的杀人案也正是程剑如一手侦破的。打击报复还是阻碍调查，种种迹象表明此案有别的可能和背景，但在调查过程中却查无实证，公安局交警队最终只能以一般交通事故结案。程剑如女儿程向坤认为母亲之死别有原因，追着肇事司机毕建财不放，却几乎陷自己于危险之中，剑如因向臻之死对其影响很大，情绪恶劣，女儿生活也无着落，因而休假在家照顾向坤，同时以个人身份开始重新调查车祸事件，就在案情将要水落石出之际，司机毕建财却被谋杀并焚车毁尸。通过从毕建财家中搜出的一张巨额银行卡的追查，矛头渐渐指向胡俊清…红椒道：娘，我正要跟奶奶和爹娘说这事呢。　　然而还有更大的阴谋在背后蠢蠢欲动。韩午阳要找回失落的爱情，要洗刷掉强加在自己身上的不白之冤，要和战友们一道挫败敌人的一桩桩罪行和险恶计划……