An abstract base class can be used to declare references.
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Q23: You may define implementations for abstract methods
Q24: Consider the abstract class below:
Public abstract class
Q25: Operator is returns true if two matching
Q26: The keyword sealed is applied to methods
Q27: Classes and methods are declared sealed for
Q29: An abstract class may be derived from
Q30: Which of the following statements about abstract
Q31: A convention of the UML is to
Q32: If the base class contains only abstract
Q33: All methods in an abstract class are
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