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已建立一个名为teacher的类,保存该类的类库名称是mylib,则删除该类正确的命令是( )。

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private class MyClass extends Object  class UyClass extends Object  public class MyClass  private class MyClass extends Object  
CREATE CLASS mylib OF myteacher AS Teacher  CREATE CLASS myteacher OF Teacher AS mylib  CREATE CLASS myteacher OF mylib AS Teacher  CREATE CLASS Teacher OF mylib AS myteacher  
CREATE CLASS mylib OF student AS Pcrson  CREATE CLASS student OF Person AS mylib  CREATE CLASS student OF mylib AS Person  CREATE CLASS Person OF mylib AS student  
CREATE CLASS mylib OF student As PerSon  CREATE CLASS studem OF Pemon As mylib  CREATE CLASS Student OF mylib As PerSon  CREATE CLASS Person OF mylib As student  
CREATE CLASS mylib OF student As Person  CREATE CLASS student OF Person As mylib  CREATE CLASS student OF mylib As Person  CREATE CLASS Person OF mylib As student  
VFP将用户自定义子类保存在扩展名为.vcx的类库文件中  一个VFP类库文件中可以保存多个自定义子类  只能基于VFP的基类创建子类  在VFP中,可以使用“类设计器”或“表单设计器”创建子类  

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