單項(xiàng)選擇題
有如下程序: #include using name space std; classB{ public: B(int xx):x(xx){++count;x+=10;} virtual void show()const {cout<<count$amp;A.1_120
B.2_120
C.1_20
D.2_20
有如下程序: #include using name space std; classB{ public: B(int xx):x(xx){++count;x+=10;} virtual void show()const {cout<<count$amp;A.1_120
B.2_120
C.1_20
D.2_20