多项选择题

下列各项中,属于外来原始凭证的有( )。 A.
火车票 B.
销货发票 C.
购货发票 D.
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大量使用农药会导致环境污染和天敌杀伤。

答案：正确

单项选择题

Consideringthe member functions in the following two classes, which implements function overriding?
class Base
{public:
virtual void f1( ) ;
virtual int f2( ) ;
char f3( char* );
};
class Derv: public Base
{public:
int f1( ) ;
int f2( int ) ;
virtual char f3( char* );
};
A、Base::f1( ) and    Derv::f1( )
B、Base::f2( ) and    Derv::f2( int )
C、Base::f3(char * ) and Derv::f3( char* )
D、None of the above answers are correct.