压敏电阻广义的残压是指雷电通过压敏电阻时在其两端存在的()电压。
A.额定
B.瞬时钳位
参考答案:B
下面程序的运行结果是( )。 #include<iostream.h> class base protected: int a; public: base()cout<<“0”; ; Class base1:virtua1 base public: base1()cout<<“1”; ; class base2:virtual base public: base2()cout<<“2”; ; Class derived:public base1,public base2 public: derived()cout<<“3”; ; void main() derived obj; cout<<endl;
A.0123
B.3120
C.0312
D.3012
羊毛或动物细毛制男式便服套装