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感觉活不下去的苍蝇，无法诉说梦想，过着OL生活…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.The newly trained classifier is compared with the previous classifier to estimate how much change has taken place. For example, you can perform a dark launch and compare two outputs over the same traffic. Alternatives include A/B testing and backtracking testing for a small portion of traffic.他尚且不知道西北角魏军已经悄然撤退，而且还在军中开始制造混乱，东南角的彭越不知何时也消失的不见踪影。敖鸾深深看着周青，眼角流下最后一滴泪，宝剑一横，香消玉殒，元灵飞向封神榜。　　某市一连串发生命案，经调查这都与涉毒有关，为此，公安局张局长指示刑警队队长雷霆成立专案小组侦破这些系列贩毒案，派出所治安警沙城也加入刑警队专案小组。在办案过程中，队长雷霆等干警发现新型毒品已经开始渗入某市。为了打击制毒犯罪团伙，追查制毒配方的来源，公安局领导安排年轻的女刑警张叶和沙城一起到大学化学楼展开调查，张叶和沙城在调查中发现科技精英宫教授竟然是罪恶的帮凶。为了引出毒枭昆哥，雷霆派张叶只身进入敌穴展开智与勇的较量，终于在两代警员的共同努力下，破获了一个利用娱乐城贩毒的犯罪团伙。　　黑木华表示，这个故事很有趣，自己也很喜欢，现实生活里也是和女主角一样的性格，所以很明白她的那种容易焦躁的个性