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【单选题】
关于构造方法特点的说明,下列正确的是()。A.
构造方法的返回值类型必须是void类型
B.
在定义类时，如果没有定义构造方法，系统会自动生成一个无参数的构造方法
C.
在创建子类时，会自动调用父类的有参数的构造方法
D.
构造方法是多余的
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【单选题】用实验方法对记忆进行研究，揭示了遗忘规律的学者为
A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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