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但是，一天赎物不缴清，公主绝不能放。One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.这个消息一出来，所有书友全都激动起来，奔走相告。然而此番事出突然，机会骤然来临，冒顿单于心痒难耐。王离？他不是远在西北长城吗？苏岸和蒲俊有些不解。2. It is not difficult to make preserved pork chafing dish. The most critical side dishes are the big leek roots, potatoes, tomatoes and celery listed by me. If you want to re-carve, please be sure to prepare these dishes. However, if it is not necessary to be exactly the same, it is not bad to make it with substitutes.Supplier participation also means the joint development of new products/technologies, the exchange of data and information, the sharing of market opportunities and risks. Under the environment of JIT production, manufacturers no longer only consider the price when selecting suppliers, but pay more attention to selecting suppliers who can cooperate well in quality service, technological innovation, product design, etc. Suppliers supply various factors of production (raw materials, energy, machinery and equipment, spare parts, tools, technology and labor services, etc.) for the production and operation of production enterprises. The quantity and price of factors provided by suppliers directly affect the quality of enterprise production, cost and product quality.