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--Failure, PromptPicture above first.Through the management of the connection pool, the sharing of database connections is realized, and the connection does not need to be recreated every time, thus saving the overhead of database recreation and improving the performance of the system! This chapter explains 7 structural patterns, due to space problems, the remaining 11 behavioral patterns,小葱就对随赵清进来的一个小女娃——叫九儿的，约莫七八岁，是医学院的学生——低声说了几句，她便抿嘴一笑，转身跑出去了。61. X.X.2389. Where for any sufficient reason it is impossible for a ship not normally engaged in towing operations to display lights as required by paragraph 1 or 3 of this regulation, such ship shall not be required to display lights when engaged in towing another ship in distress or in need of rescue. However, all possible measures as permitted by Article 36 shall be taken to show the nature of the relationship between the towing vessel and the towed vessel, and in particular the towing cable shall be illuminated.你需要工具。