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8. Improve the model or design a new model according to the analysis;泥鳅姑姑站起身，拍着手道：不提？我在家忙得昏天黑地的。Javascript neither supports abstract classes nor has the concept of interfaces. Therefore, be very careful when using the state mode. If you forget to implement the buttonWasPressed method for a state subclass when writing a state subclass, an exception will be thrown when the state switches. Because Context always delegates requests to the buttonWasPressed method of the state object. Therefore, let the abstract method of the abstract parent class throw an exception directly, which will be found at least during the program run.Generating light drawing files according to GERBER format, including copper foil patterns, silk screen patterns, solder mask patterns, hole positions and external dimension patterns of component surfaces and soldering surfaces; Generate NC drilling files required by manufacturers. Provide disk files and print samples.P.sendline (payload1)