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For example, I invited a sister to a restaurant for dinner, but I didn't know her preferences. In this way, we will take our sister to the hotel and let her order what she likes when ordering. This also realized the factory model, but I don't have to care about what my sister likes to eat, but let her decide what to eat.Node simplifies the problem by starting to create exports objects during a module load. If it needs to introduce other modules and has circular dependencies, it can only be partially introduced, that is, only the part defined before the circular dependencies occur can be introduced.今年暑假广为好评的《被不良少年盯上》正式续订第二季，将于2020年播出。故事讲述Beat是著名科技舞曲俱乐部的推广人员，欧洲特勤局把他招募进来，担任秘密内幕人员。这时，他发现了他关系网络中令人震惊的腐败现象。In summer, the temperature of the network cable in some concrete structural layers is as high as over 40 degrees. In some cases, it may be higher. Therefore, when we choose the network cable, we must consider the sensitivity of the network cable performance to temperature.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![Reissue] First Certificate of Wuxi Enterprise: 35 yuan/Zhang; One Family with Multiple Certificates: 50 yuan/Zhang Nanjing Human Resources and Social Security Bureau: http://www.njhrss.gov.cn/