有如下类定义： class Base1{ int m; public: Base(int m1): m(m1){} }; class Base2{ int n; public: Base(int n1): n(n1){} }; class Derived: public Base2,public Base1{ int q; public: Derived(int m1, int n1, int q1): q(q1),Base1(m1),Base2(n1){}; };在创建一个Derived对象时，数据成员m、n和q被初始化的顺序是