【单选题】【消耗次数：1】
由纯粹的几何点、线、面、体组成的视觉符码属于( )。
①
具像类
②
抽象类
③
半抽象类
④
半具像类
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相关题目
【单选题】
下列关于纯虚函数与抽象类的描述中，（）是错误的。
①
抽象类是指具有纯虚函数的类
②
纯虚函数是一个特殊的虚函数，它没有具体的实现
③
一个基类中说明具有纯虚函数，该基类的派生类一定不再是抽象类
④
抽象类只能作为基类来用，其纯虚函数的实现由派生类给出
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