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Explain that in the OrderPizza method, we do a lot of things, including calling the CreatePizza method to generate a desired pizza, and then doing a series of operations on the pizza. The key point is that Pizza is defined as an abstract class, which means that in the OrderPizza method we don't care what type this Pizza is at runtime, in other words, this is decoupling. The coupling between PizzaStore and Pizza is uncoupled.4. Charm 4: 101-3000.1. The proportion method is to determine a certain proportion of households with the lowest per capita income as poor households according to the survey data of urban residents' household income, calculate the per capita living expenses of poor households, multiply the maintenance coefficient of each employed person, and add an adjustment.三国两晋时期，司马家族发迹，司马懿工于心计，在熬死曹操、曹丕之后，逐渐进入政权中心，诛杀曹爽之后，司马懿三父子更是为所欲为，为了巩固政权，司马家族拉拢魏晋名士，皇甫谧、嵇康等竹林七贤被迫逃避时局而隐居，但是仍然难免杀身之祸。　　故事改编自真人真事。Move