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NBC宣布一口气续订《#芝加哥警署#ChicagoP.D.》三季。The principle of opening and closing means opening to expansion and closing to modification. When the program needs to be expanded, the original code cannot be modified, but the original code should be expanded to achieve a hot plug effect. Therefore, a summary of one sentence is: in order to make the program scalable, easy to maintain and upgrade. To achieve this effect, we need to use interfaces and abstract classes, etc. We will mention this point in the later specific design.First presentation page (test):　　黑龙江省边境小镇黑河，在时任警备司令的马占山治理下，百姓安居乐业，却不料日军悍然发动“九一八事变”。马占山临危受命，被任命为黑省代主席，总揽军政。This view is somewhat outdated and inaccurate. It is the computer that myths those people. We always think that those who deal with computers are different from ordinary people.因剧中不止两人，在黄豆编写的时候，掌柜的花银子请来两位常在茶楼卖唱的父女配合他们。书儿忙笑道：我正要说呢。