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【单选题】
白细胞分类的主要依据是A.
胞质内有无颗粒
B.
胞质内有无特殊颗粒
C.
细胞核的形态
D.
胞质的嗜色性
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【单选题】某软件公司开发了一组加密类,在使用这些加密类时欲采用简单工厂模式进行设计,为了减少类的个数,将 工厂类和抽象加密类合并,基本UML类图如下图所示。以下称述错误的是()
A.
在类图中，Cipher类既充当抽象产品类，又充当工厂类
B.
工厂方法createCipher()的返回类型为Cipher
C.
工厂方法createCipher()应定义为静态方法
D.
Cipher类中的encrypt（）方法必须为抽象方法
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