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Answer: The similarity of these three modes is that they all serve as an intermediate layer between the client and the real used class or system, which plays the role of allowing the client to indirectly call the real class. The difference is that the application occasions and intentions are different.PS: Many forums have seen beginners ask whether WCF still needs to learn in depth, because they think these technologies may be outdated. Maybe Microsoft will launch a new SOA implementation scheme at that time. Wouldn't it be a waste of time to learn in depth, so they feel that there is no need to learn in depth and just know how to use them. I had the same feeling about this problem before, but now I think that although WCF technology may be replaced, the key to understanding a technology in depth is not to know some more advanced API calls, but to understand its implementation mechanism and way of thinking. Even if the latter technology is replaced, the mechanism behind it is definitely similar. Therefore, if you have a thorough understanding of a technology, you will feel familiar with the new technology and relaxed about it. In addition, after you have a thorough understanding of a technology, you dare to say that you have mastered the technology well during the interview, instead of saying that you use it a lot at ordinary times. Once you ask deeply, you do not know the implementation principle behind it. This is also why I want to write WCF series. I hope this opinion is helpful to some beginners.Total quality management is the focus of JIT production system. As the implementation of JIT production mode will lead to a sharp drop in the inventory level of WIP and finished products, in this case, the emergence of a large number of defective products is likely to stop the production of enterprises, delay the delivery time of products, and cause unnecessary losses to enterprises.Motion SystemNew Zealand is the last land discovered by human beings in the world. Its rich products and magnificent and fantastic geological landscape have attracted immigrants from all over the world, thus giving birth to a colorful, open and inclusive New Zealand culture. More than 1,000 years ago, Maori sailed wooden boats across the sea to come here. More than 700 years later, the European continent's maritime fleet settled here. For more than 200 years, groups of dreamers who have left their homes from Asian and Pacific islands have worked hard here to build and interpret their dreams. This film takes New Zealand's immigration history as a narrative clue and shows New Zealand's unique immigration culture. The inclusive and open multi-culture of New Zealand today is reflected by shooting Maori's life scenes with extremely rich ethnic characteristics, singing and dancing performances, etiquette and customs, and the city features established by descendants of European and Asian immigrants, with the story of local Chinese families as a shooting focus. (Charming New Zealand Episode I Colorful Country)太宰走后，英布又是一声长叹。In order to reach a rich level of green coloring,