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13. Os.chdir ()--Change directory to specified directoryPrinted boards must be dried for a storage period of more than 3 months. The welding conditions are 120 ℃ for 3 hours.Attacker: The computer used by the attacker is the attack console, which can be any host on the network or even an active laptop. The attacker manipulates the whole attack process and sends attack commands to the master.Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:告白の順番然后，大屏幕上出现几个大字——笑傲江湖之东方不败。汪魁坐在马上哈哈大笑道：胡钧，你可吃大亏了。