有以下程序
#include＜iostream＞
#include＜string＞
using namespace std；
class base

private：
charbaseName[10]；
public：
base()

strcpy(baseName,"Base")；

virtual char*myName()
return baseName;

char *className()

return baseName;

;
class Derived: public base

private:
char derivedName[10];
public:
Derived()

strcpy(derivedName,"Derived");

char *myName()

return derivedName;

char *className()

return derivedName;

;
void showPtr(base &p)

cout＜＜p.myName0＜＜" "＜＜p.className();

int main()

base bb;
Derived dd;
showPtr(dD) ;
retum 0;

动行后的输出结果为

A．Derived Base

B．Base Base

C．Derived Derived

D．Base Derived

异步电动机运行中应注意什么？