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Structure of Air Damping Time Relay3. Is the emergency response effectiveA. Men: single paddle, double paddle, double paddle without helmsman, double paddle without helmsman, four paddle without helmsman, four paddle without helmsman, four paddle with helmsman, eight paddle with helmsman;天启，快点更新，我已经忍不住想看张小凡和林惊羽长大后相爱相杀的场景了。Visitor pattern decouples the data structure from the operations acting on the structure, making the operation set relatively free to evolve. Visitor pattern is suitable for systems with relatively stable data structure and easy change of algorithm. Because visitor mode makes it easy to increase algorithm operation. If system data structure objects are easy to change and new data objects are often added, visitor mode is not suitable. The advantage of visitor mode is that it is easy to add operations, because adding operations means adding new visitors. Visitor mode centralizes the relevant behaviors into one visitor object, and its changes do not affect the system data structure. Its disadvantage is that it is difficult to add new data structures. -From Encyclopedia