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The concept of MDT diagnosis and treatment mode can be traced back to the 1960s and 1970s. In 1965, the Northern California Children's Development Center put forward a plan to develop a multidisciplinary diagnosis and consultation clinic for mentally retarded children, and stressed the importance of multidisciplinary cooperation in the clinic. In 1993, Britain applied the multidisciplinary cooperation model to community health care work, and proposed that medical work should change from the original one-way service model provided by a single doctor to a patient-centered multidisciplinary cooperation medical model. In 1997, the International Colorectal Cancer Working Group (IWGCRC) recommended MDT diagnosis and treatment mode for colorectal cancer patients in all European and American hospitals, and strictly stipulated the composition of MDT. Since then, MDT model has gradually been promoted and perfected in Germany, France, Italy, the United States and other countries where medical centers are relatively large. In 2000, the Commonwealth Government emphasized the importance of MDT in the diagnosis and treatment of cancer patients in the National Cancer Plan, pointing out that the close cooperation of MDT members can increase the survival rate of patients. At present, many cancer diagnosis and treatment guidelines in Europe and the United States stipulate that all patients with confirmed tumors must undergo relevant MDT consultation before receiving treatment. MDT model has become an important part of the medical system of European and American hospitals. With the accumulation of a large number of successful experiences of MDT, MDT, a medical model, is not only gradually accepted and valued by everyone, but also its connotation is continuously enriched and improved under the modern hospital management concept. MDT model is not only limited to multi-disciplinary consultation of patients, but also guides the whole medical process and上世纪初，军阀吴大帅攻打下石头城后，梦想做皇帝。军师半梦道人妄图夺取浮屠秘术，假借改命之说，引祸郎中德一，圆大帅皇帝梦。德一为报师们和妻女之仇，也为世间不再生灵涂炭，利用景侍卫巧妙布局设套。最终，半梦道人作茧自缚，大帅命丧黄泉。3. Slow post request attackThe Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu