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【单选题】
股票最基本的特征A.
流动性
B.
收益性
C.
风险性
D.
永久性
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A.
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A.
不同的类可以产生相同类型的对象
B.
类是一种类型,它定义了数据和操作
C.
对象是类的实例
D.
任一对象必属于一个类
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