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For children who have just played basketball, I don't think they need to buy too good a ball. About 100-150 balls are enough, and the quality is very good, and about 90 balls can also be used. What matters is not the ball, but the love of basketball. For the ball, as long as it is not too bad rubber ball, it is OK.The observer mode defines a one-to-many dependency relationship, allowing multiple observer objects to monitor a certain topic object at the same time. When the state of this topic object changes, all observer objects will be notified so that they can automatically update their behaviors. The specific structure diagram is as follows:The above configuration process takes only one time, and then you can happily use the service iptables save command to save iptables rules in centos7.广东卫视《国乐大典第2季》2019年7月5日期每周五晚播出。节目内容围绕中国民乐主题展开，几乎囊括了中国各民族的传统器乐品种，打破常规器乐节目之中只有乐器演奏的传统，将经典的国乐作品重新配器编曲，糅合戏曲、舞蹈、吟唱、吟诵、话剧、诗赋等多种文化元素进行全新改编，融合传统与现代的表达，用唯美和流行兼备的演绎，展示了民族优秀传统文化的经典力量,竞演乐团融合创新民乐演奏手法与多元艺术形式，带来意想不到的新颖演奏版本，重释国乐经典曲目。　　《校长》：60年代，社会清贫，但求学者众。一位执笔忘饭的校长与善良淡雅的王老师让一座天台学校成为童年岁月里最温暖的家。Chapter I General Provisions