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3. Aircrew Physical Examination Certificate京城中发生离奇的连环自杀案，铁案门派出名捕“神鹰”展开调查。他循着蛛丝马迹，很快获得重要线索，断定真凶就匿藏于东才书院之中！于是他伪装成学生身份，潜入东才学院寻找幕后真凶。而此时坊间传出妖狐杀人的流言，令神鹰深感这起案件并不单纯。随着调查的深入，他发现连环自杀案与一年前的另一宗命案关系紧密。几经困难，神鹰最终发现破案关键，欲将凶手缉拿归案。这一次，他将利用自己生命作为赌注，解开妖狐杀人的真相……Two, non normal major graduates to apply for teacher qualifications should be deployed according to the provincial education department to supplement pedagogy and psychology courses, and the provincial education department unified organization examination qualified.美国CIA特工受命潜入俄罗斯西伯利亚的俄天然气开采公司，希望以此阻拦俄罗斯人获取廉价开采天然气的新技术。到达寒冷的目的地后，他发现周围的一切并不简单。这一出去，外面冬日萧条，全靠她们妆点大自然了。Although there are subclasses in java that implement the interfaces of the parent class, But I think javascript can be different from java, It is possible that the parent class in java is an empty class, Subclasses to implement the interface of the parent class, in javascript, I think the common code is completely written in the parent function. If the business logic needs to be changed in the future, or new business logic is added, we can completely use subclasses to rewrite the parent class, so the code has strong scalability and is easier to maintain. Since I am not a professional java, please understand if there is any mistake in describing the knowledge points in java ~ ~