class ClassA { public: virtual ~ ClassA() {}; virtual void FunctionA() {}; }; class ClassB { public: virtual void FunctionB() {}; }; class ClassC : public ClassA,public ClassB { public: }; ClassC aObject; ClassA* pA=&aObject; ClassB* pB=&aObject; ClassC* pC=&aObject;关于pA,pB,pC的取值,下面的描述中正确的是: