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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!Now we can override the methods in the parent class Interview in the subclass BaiDuInterview; The code is as follows:找不到人，才用了个假孩子代替。讲述了推理女王刘雪玉（崔江姬 饰）与冷酷的热血刑警何完胜（权相宇 饰）组成拍档，并一起调查各种犯罪事件的推理故事。It is already the highest sales volume in the history of the single title of the card form, and it is still setting new records. After the ice sheet is released, 20 million yuan is also in sight.Information Theory: I forget which publishing house it was. It is a very thin book and it is very good. There is a good talk about the measurement of information, the understanding of entropy and the Markov process (there is no such thing in the company now, I'll go back and find it and make it up). Mastering this knowledge, it is good for you to understand the cross entropy and relative entropy, which look similar but easy to confuse. At least you know why many machine learning algorithms like to use cross entropy as cost function ~Which is more harmful, iqos or real smoke? Since the advent of IQOS, although its development speed has exceeded everyone's expectations, there are still many voices of doubt about the attitude towards IQOS. Doubts about IQOS mainly revolve around whether IQOS is really healthier than traditional cigarettes. Fillmore International is also releasing research data reports on various products in succession, and some international health organizations are also conducting research on this issue. As ordinary consumers, we not only wait and see, but also have our own practical methods.