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Given： Which two classes use the Shape class correctly？（）
A:public class Circle implements Shape {private int radius；}
B:public abstract class Circle extends Shape {private int radius；}
C:public class Circle extends Shape {private int radius；public void draw（）；}
D:public abstract class Circle implements Shape { private int radius；public void draw（）；}
E:public class Circle extends Shape {private int radius；public void draw（） {}}

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出自：Oracle认证

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