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Lins' eldest son 04杨长帆凭借本能招待二人，心中默念——就像在自己家一样。(a) the designated medical institutions intentionally report false information to the medical security administrative department;(2) Fire safety assessment agencies can engage in regional fire safety assessment, social unit fire safety assessment, large-scale activity fire safety assessment, special fire design scheme safety assessment and other activities, as well as fire laws and regulations, fire technical standards, fire hazard rectification and other aspects of consulting activities.1. There are two options to manage the creation and destruction of state objects. The first is to create and then destroy state objects only when they are needed, and the other is to create all state objects from the beginning and never destroy them. If the state object is relatively large, the first method can be used to save memory, which can avoid creating some objects that will not be used and recycle them in time. However, if the state changes frequently, it is best to create all these state objects in the first place, and there is no need to destroy them, because they may be used again soon.I follow the execution process of this small program: first, take exp and "\ +" as parameters, call the calculation (String, String) method in the AbstractCalculator class, call split () of the same kind in the calculation (String, String), then call the calculation (int, int) method, enter the subclass from this method, after executing return num1 + num2, return the value to the AbstractCalculator class, assign it to the result, and print it out. It just verified our initial thinking.