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马镫出现的非凡意义不言而喻，为何这样说呢？马镫发明以后，使战马更容易驾取，使人与马连接为一体，使骑在马背上的人解放了双手，骑兵们可以在飞驰的战马上且骑且射，也可以在马背上左右大幅度摆动，完成左劈右砍的军事动作。　　3. Some types, such as the core trading engine of the exchange, control the trading process. If multiple types can be created, the system will be completely chaotic. (For example, if there are multiple commanders in an army who command at the same time, there will definitely be a mess), so only by using the singleton mode can the core transaction server independently control the whole process. The following is an analysis of some examples that we need to pay attention to when applying singleton pattern in the development process.Updated January 30After creating some subclasses of Pizza, you can start testing:泰剧最后一间房Forty-seventh fire technical service institutions in violation of these Provisions, one of the following circumstances, shall be ordered to make corrections, fined 10 thousand yuan to 20 thousand yuan: