两个电容值为C的电容串联,此支路的等效电容值是()。
A.C
B.2C
C.1/2C
D.1/C
参考答案:C
细胞膜的功能。
若有以下程序: #include <iostream> using namespace std; class Base { private:int a,b; public:Base(int x, int y){ a=x; b=y;}void show(){ cout<<a<<", "<<b<<end1;} }; class Derive : public Base { private:int c, d; public:Derive(int x, int y, int z,int m):Base(x,y){ c=z; d=m;}void show(){ cout<<c<<", "<<d<<end1;} }; int main ( ) {Base b(50,50) ,*pb;Derive d(10,20,30,40);pb=&d;pb->show {);return 0; }
A.10,20
B.30,40
C.20,30
D.50,50