请写出如下程序的输出结果:
#include class R{public:R(int r1,int r2) {R1=r1;R2=r2;}void print();
void print() const;private:int R1,R2;};void R::print(){cout<< R1<< ":"<< R2<< endl;
}void R::print() const{cout<< R1<< ";"<< R2<< endl;}void main(){R a(5,4);a.print();
const R b(20,52);b.print();}
阅读下面事件过程,写出执行结果。
Private Sub Command1_Click()
Dim a%, b%, c%, s%, w%, t%
a = -1: b = 3: c = 3
s = 0: w = 0: t = 0
If c > 0 Then s = a + b
If a <= 0 Then
If c <= 0 Then
w = a - b
End If
Else
If c > 0 Then w = a - b Else t = c
End If
c = a + b
Print a, b, c
Print s, w, t
End Sub
写出下面程序运行时单击窗体的输出结果。
Private Sub f(a%, b%)
a = a + b
b = a - b
End Sub
Private Sub Form_Click()
Dim a%, b%
a = 23
b = 12
Call f(a, b)
Print "a=" & a; ",b=" & b
End Sub
有线电视系统中,()是“分贝”这个单位正确的表达方式。
A.dB(分贝)=101g((Po/Pi)
B.dB(分贝)=10lg(Pi/Po)
C.dB(分贝)=201g((Ui/Uo)
D.dB(分贝)=10le((Po/Pi)
某微机控制系统使用PI调节方法,采样周期T=6s,Ti=120S,Kp=2,现测得:ei=10Pa,ei-1=7Pa,求。
设为直角坐标系,又Pi(xi,yi,zi)(i=1,2,3)为不同的三点
l)确定线段P1P2的中点坐标:
2)若P1,P2,P3不共线,试证△P1P2P3的重心的坐标为
(注:设Pi(xi,yi,zi),i=1,2....n.则由坐标
所确定的点P称为Pi(1≤i≤n)的重心.)