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Endothermic theory: When the flame retardant is heated, endothermic reactions occur, such as decomposition, melting, sublimation, phase change, etc., which make the fiber dissipate heat rapidly and fail to reach the combustion temperature.State mode refers to allowing an object to change its behavior when its internal state changes. The object seems to have modified its class. Divide this sentence into two parts by commas. The first part means to encapsulate the state into a separate class and delegate the request to the current state object. When the internal state of the object changes, different behavior changes will be brought about. The second part is from the customer's point of view, the object used has completely different behaviors in different states. The object seems to be instantiated from different classes, but in fact this is the effect of using delegates.采儿笑嘻嘻地说道：咱姑娘是最美的了。你看过我了，赶紧走吧。事实很清楚地告诉他们，昨晚根本就是越国的伏击援军的计策。MDT team members should have corresponding training opportunities to enhance their professional skills and cooperation ability in MDT team.Not only does it mean that after the content production is completed, the operation measures are over. These contents should be better distributed inside and outside the product, so as to make full use of the content and maximize the value of the content.