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翘儿焦急道，现在不也挺好。严总督先收到的信，看过之后又封了回去，福建不归他管，转给北京。That is to say, the less a class knows about the classes it depends on, the better. In other words, no matter how complex the dependent class is, the logic should be encapsulated inside the method and provided to the outside through the public method. In this way, when the dependent class changes, it can minimize the impact on the class.When making decisions, one should not immediately think about what activities or plans to do to detonate. These are only means of execution and are the final result of the decision-making process.What is the event distribution mechanism?The starting point of JIT production is to minimize waste and make continuous improvement. Waste refers to all activities that cannot create added value. There are seven common waste phenomena in enterprises: waste of excessive production, waste of shutdown for materials, waste of handling methods, waste of processing itself, waste of inventory, waste of action and waste of manufacturing waste and defective products.