（ ）是把对象的属性和服务结合成一个独立的系统单元，并尽可能隐藏对象的内部细节；（ ）是指子类可以自动拥有父类的全部属性和服务；（ ）是对象发出的服务请求，一般包含提供服务的对象标识、服务标识、输入信息和应答信息等。
问题1选项
A.继承
B.多态
C.消息
D.封装
问题2选项
A.继承
B.多态
C.消息
D.封装
问题3选项
A.继承
B.多态
C.消息
D.封装
正确答案及解析
正确答案
解析
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