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I follow the execution process of this small program: first, I take exp and "\ +" as parameters, call the calculation (String, String) method in the AbstractCalculator class, call split () of the same kind in the calculation (String, String), then call the calculation (int, int) method, enter the subclass from this method, after executing return num1 + num2, return the value to the AbstractCalculator class, assign it to result, and print it out. This just verifies our thinking at the beginning.Jacket, underwear, head and shoulder, belt, shoesThe specific codes are as follows:Telecommunications梁笑棠重返警队当教官，加入刑事情报科培育新一代卧底，并认识了聪明机警的古惑仔苏星柏。二人建立警察和线人的关系，合作无间，兄弟相称，但心思慎密的星柏只想凭借笑棠之力助自己登上坐官之路，而他和青梅竹马的女友大律师姚可可若即若离，因各人心底里永远缺乏一份信任。棠的上司周望晴督察貌似其已故女友，因工作关系与笑棠日久生情，但二人感觉总徘徊在上司和情人之间，因而衍生不少冲突、矛盾与考验。望晴与警司巩家培是师徒关系，二人觉得笑棠适应不了过于纪律的生活，直至星柏为上位牺牲笑棠的同僚，笑棠不惜身犯险境，重操旧业做卧底对付星柏，危机一触即发……In fact, the appearance of interactive game APP products for children's thinking ability was earlier than that of online class products, such as Wukong Mathematics, Dudu Mathematics and Yangyang Love Mathematics, which were all introduced to the market around 2012. However, due to the limited market demand environment at that time, they failed to achieve explosive development.1947春解放战争开始的第二年，蒋介石放弃了对解放区全面进攻的策略，缩短战线，集中其精锐兵力，对陕北、山东、华北等主要解放区实施重点进攻。3月13日公民党绥晋公署主任胡宗南指挥34个旅约24万人，围剿陕、甘、宁解放区直逼延安。3约19日中国人民解放军西北野战队在掩护中央机关转移后，主动撤离延安。以此同时，在山东战场蒋介石一边命令陆军司令顾祝同指挥60个旅约45万人打通京福路一段，占领鲁南解放区呈弧形向鲁中山区推进，一遍又准备从山东抽调部队增援东北并打算在中原地区增兵100万，加强各个战场的力量。