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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.Zhao Yuan, founder of Yixiu Mathematical Thinking: "Thinking ability products are not as direct and obvious as programming can make some programs, or as direct and obvious as mathematics can calculate a problem. Therefore, how to formulate an evaluation standard recognized by parents and present the curriculum effect is a big challenge that the industry will face."　　最后，晓红竟给他们一个离奇的答复…Tashi Villagers: I don't believe it. I didn't believe it at that time. You lied.项羽都挡不住我们的兵锋，更何况是越军。我是陈启，笔名天启，很高兴见到大家。Article 9 [Joint Supervision] The medical security administrative department of the people's government at or above the county level shall, according to the needs of the work, jointly carry out multi-department joint inspection with relevant departments.