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Difference mode. According to the brightness distribution of the colors on the upper and lower sides, the color values of the upper and lower pixels are subtracted. For example, if the maximum white value is used for Difference operation, the inverted effect will be obtained (the lower color is subtracted to obtain the complement value), while if the black value is used, there will be no change (the black brightness is the lowest, the lower color subtracts the minimum color value of 0, and the result is the same as before).闪闪发光在突然被丢进的电视购物的世界，通过与原人气童星的发表者樱木优（中村隼人）等周围的人物的关系，作为发表者一点点成长。The reason why the logic for creating an object is put into a separate class is that it can be used by multiple clients. And separates the creation and use of objects. However, this design also has many defects. First of all, SimpleFactory is a specific class, so we must program for the implementation, making the system lose its flexibility in this respect. Second, if we add new products, we have to modify the code in SimpleFactory, which violates the opening and closing principle. The above model is also called simple factory. He does not appear in GOF mode, it is more like a programming habit.讲述约翰·达顿（凯文·科斯特纳饰）是达顿家族的一家之长,达顿家族拥有着美国最大的牧场,与牧场毗邻的有美国首个国家公园黄石,印第安人保留地以及土地开发商买下的地皮。在一次因牲畜误入印第安人保留地所引起的争端中,意外伤亡事件发生,一场涉及多方的争端在蒙大拿州这片美丽的土地上拉开了序幕。随着剧集的进行,他不断受到那些试图控制牧场的势力挑战。1921年，毛泽东带着第一次回门的媳妇杨开慧和小弟毛泽覃回乡去见二弟毛泽民，并要泽民跟随自己闹革命，泽民坚决反对，称要守住家业。在毛泽东的劝说和泽覃的坚持下，为了一句“兄弟不分家”，泽民最终随毛泽东踏上了革命的道路。走上革命道路的泽民和泽覃遇到各自不同的困难，在大哥的开导和指引下，两人纷纷走出困境，革命事业也很快步入正轨。泽民成熟稳重的心性使他成为革命的管家，英勇善战的泽覃则选择追随朱德、陈毅的部队。第五次反围剿失败后，毛泽东率队长征，毛泽民负责转运整个红色银行的财产，毛泽覃受命转战闽赣边界。1935年4月，泽覃在江西瑞金山区被国民党军包围，为掩护游击队员脱险，英勇牺牲。在成功解决货币流通问题后，泽民被派往新疆整顿经济，与军阀盛世才斗法。盛世才投靠蒋介石，将拒绝写脱党关系书的泽民秘密杀害。开国大典前夕，毛泽东陷入深深的回忆之中，泽民、泽覃仿佛站在他身边，三兄弟再次相聚。Online work class refers to a teaching scene in which real teachers teach online, which includes live online teaching and recorded video teaching. In the first half of this year alone, six online children's thinking ability training companies received financing, with a total amount of more than 600 million yuan.Now, let's imagine why these "checkpoints" are called "chains" in iptables. As we know, The purpose of a firewall is to match "rules" for passing messages, Then execute the corresponding Action, So, when the message passes through these checkpoints, You must match the rules on this level, However, there may be more than one rule on this level, But there are many rules, When we put these rules in a chain, A "chain" has been formed. Therefore, we imagine each "checkpoint" as shown in the following figure. In this way, it is more appropriate to call them "chain". Each message passing through this "checkpoint" must match all the rules on this "chain". If there are qualified rules, the corresponding actions of the rules will be executed.