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The following is the definition of the factory method: an interface is defined to create an object, but the subclass decides which one to create. The factory method defers this process of creating objects to subclasses.? Singleton pattern is the most common and simplest design pattern in design pattern, which ensures that only one instance exists in the program and can be accessed globally. For example, account information object management used in actual APP development? Objects (SQLiteOpenHelper) and so on all use singleton mode. This model has several advantages:本片取材自真人真事。在上世纪30年代，有一个名叫马文·托尔森（丹泽尔·华盛顿饰演）的美国黑人在语言修辞上有着很深的造诣，尤其擅长写诗和辩论。事实上他后来也被认为是那个时代最伟大的诗人之一。当时，他在一所德州的黑人高校中担任教授。Therefore, Naruto's current strength setting is actually higher than that of high winds.朝夕相处二十多年的妹妹，是自己的亲生女儿；神出鬼没二十多年的匿名勒索，是自己的弟弟；尊敬倾慕二十多年的父亲，是自己的杀父仇人……一个悲苦的女人与几个男人离奇的情仇纠葛，首度犀利披露了家庭冷暴力的隐患！在距滨州市有二百公里的景南镇上，住着一户姓苏的外乡人家。他们是十年前才迁居到这里的，没有父母，只有兄弟姐妹三人一起生活。大姐叫苏雅琴，44岁。多年来，她总是接到一个自称是“陌生人”的男人打来的匿名电话，并以苏雅琴内心的秘密相威胁，向其勒索钱财，令苏雅琴惶惶不可终日。与此同时，也许正是因为她至今未婚的缘故，那上门提亲的人是络绎不绝。可是不知为什么，都会被她逐一挡了回去。大弟叫苏大明，年近30岁，文化程度只有初中……The nameThree, run block? Command to fill in "Elevation" in "Name" of "Block Definition" window; Click the button to the left of "Pickup Point" and the "Block Definition" window will be temporarily hidden. Capture and click the corner point under the triangle on the graph, and the window will reappear. Click the button on the left side of "Select Object" and the "Block Definition" window will be temporarily hidden again. After selecting the whole graphic, press Enter and the window will appear again. Click Convert to Block; Click OK to close the Block Definition window.