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It can be traced back to thousands of years BC, and wrestling has been recorded in ancient civilizations of Japan, China, Greece, Egypt and other countries. Only for men.2017-07-15 13:39:33第三刑侦小组由三名警官组成。他们是复转军人靳德祥、刘刚，警校毕业生李小奇。这个小组的职责是侦破、打击形形色色车匪路霸的犯罪活动。大学舞蹈系学生柳芸儿，宏大公司业务部经理虞小娟，丽都酒店经理郭薇，三位年轻、漂亮、事业有成的现代女性，向人们诉说着一段段传统的爱情故事。从老山前线转业现任宏大公司总裁徐鹏、失学流浪儿小四川及杨小莉、刘荣荣等，从不同的矛盾当中体会他们对这个刑侦小组的情与敬。One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.Submarine main valve open