资产减值损失的确定应当在取得资产可收回金额后，根据可收回金额和账面价值相比较后获得。( )

请将下列类定义补充完整 class Base{public: void fun(){cout＜＜"Base::fun"＜＜end1;}}; class Derived:public Base { public: void fun(){ ______//显式调用基类的fun函数 cout＜＜"Derived::fun"＜＜end1; }};