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【单选题】
关于base关键字,下列使用方法错误的是()A.
在子类中，base可以调用父类的构造函数
B.
在子类中，base关键字可以访问父类的公共属性
C.
在子类中，base关键字不可以调用父类的protected成员
D.
在子类中，base关键字不可以调用父类的private成员
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【单选题】关于肘关节的描述 , 正确的是
A.
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B.
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C.
可作外展运动
D.
关节腔内有环状韧带
E.
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A.
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