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[Introduction] Five articles of the "Three Rural Areas Social Practice Report" collected by 51job Kao Network are for your reference and more relevant contents. Please visit the internship report channel.If there is no one tomorrow night, then I will delete the post.3. Some classes, such as the core trading engine of the exchange, control the trading process. If multiple classes can be created, the system will be completely messed up. (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.However, this state can be modified.辣霍霍的汤喝了出一身汗，果然痛快，不少人干脆到溪边去洗冷水澡。1. Modify the original method to adapt. This violates the principle of "opening up to expansion and closing down to modification."Fox宣布续订《紧急呼救：孤星》第二季。截至目前，《紧急呼救》第三季为Fox台本季度观看人数最多的剧集，《紧急呼救：孤星》为Fox台本季度18岁-49岁人群观看人数最多的剧集。