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(问答题) 阅读程序,给出运行结果
class A

{ public:

A ( ){cout<<"constructing A "<<endl;}};

class B: public A

{ public:

B( ){cout<<"constructing B "<<endl;}};

int main()

{ B b1;

return 0;

}

在此处作答：

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出自：东北林业大学-高级语言程序设计

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