( 25 )有如下模板声明:
template <typename T1, typename T2> class A;
下列声明中,与上述声明不等价的是
A ) template <class T1, class T2> class A;
B ) template <class T1, typename T2> class A;
C ) template <typename T1, class T2> class A;
D ) template <typename T1, T2> class A;