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Another expression of the minimum knowledge principle is to communicate only with direct friends. As long as there is a coupling relationship between classes, it is called a friend relationship. Coupling is divided into dependency, association, aggregation, combination, etc. We call classes that appear as member variables, method parameters, and method return values direct friends. Local variables and temporary variables are not direct friends. We require unfamiliar classes not to appear in the class as local variables.那时是19岁的热忱，眼前是27岁的狼狈。将欲弱之，必固强之。《别动我的抽屉》是北京广播学院电视剧制作中心、大连天歌传媒股份有限公司联合出品的都市情感剧，由李童执导，王姬、赵亮、谭凯等主演。是献给北京广播学院50周年校庆的献礼作品。该剧以都市人的情感为主线，讲述了单亲家庭中成人的悲喜、少年的青涩，以及他们之间的隔阂与沟通。第四季最后一集《A is for Answers》中，几位少女一路追踪，找到了爱丽森在费城的藏身之所，她们向她坦白，认为她的母亲就是在莫娜卸下神秘人“A”身份后继续折磨她们的继任者。对于这一切爱丽森似乎并不特别意外，只是说局面太过复杂，并向她的伙伴吐露了内心的秘密。然后，他又跳过小溪，让小葱举起灯笼照着，自己弯腰瞅准洞内，用木棒好一阵划拉。Aircraft endorsement requires two years of valid ATP (both airline license) written examination results, and then participate in the initial modification, which means determining the aircraft you will fly in the future, Boeing or Airbus, 737 or 747, etc.