（ ）设计模式能够动态地给一个对象添加一些额外的职责而无需修改此对象的结构；（ ）设计模式定义一个用于创建对象的接口，让子类决定实例化哪一个类；欲使一个后端数据模型能够被多个前端用户界面连接，采用（ ）模式最适合。
问题1选项
A.组合（Composite）
B.外观（Facade）
C.享元（Flyweight）
D.装饰器（Decorator）
问题2选项
A.工厂方法（Factory Method）
B.享元（Flyweight)
C.观察者（Observer）
D.中介者（Mediator）
问题3选项
A.装饰器（Decorator）
B.享元（Flyweight）
C.观察者（Observer）
D.中介者（Mediator）
正确答案及解析
正确答案
解析
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