97. 有如下程序：
#include <iostream>
using namespace std;
class Base {
public:
virtual void Show() { cout << 'B'; }
virtual ~Base() = default;
};
class Derived:public Base{
public:
void Show () { cout<<'D'; }
};
int main(){
Base *p1=new Derived;
Derived *p2=new Derived;
p1->Show();
p2-> Show();
delete p1;
delete p2;
return 0;
}
运行时的输出结果是______。
