已知两个周期矩形脉冲信号f1(t)和f2(t):f1(t)和f2(t)的基波幅度之比是多少?

已知两个周期矩形脉冲信号f1(t)和f2(t):f1(t)和f2(t)的基波幅度之比是多少?


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( 30 )下面程序的输出结果是Private Sub Command1_Click()ch$= ” ABCDEF ”proc chPrint chEnd SubPrivate Sub proc(ch As String)S= ””For k=Len(ch) To 1 Step-1s=sMid(ch,k,1)Next kch=sEnd SubA ) ABCDEFB ) FEDCBAC ) AD ) F

设有如下程序:Private Sub Form_C1ick()Dim s As Long,f As LongDim n As Integer,i As Integerf=1n=4For i=1 To nf=f*is=s+fNext iPrint sEnd Sub程序运行后,单击窗体,输出结果是A.32B.33C.34 0)35

下面子过程语句说明合法的是( )。A.Function f1(By Valn%)B.Sub f1(n%)As IntegerC.Function f1%(f1%)D.Sub f1(ByValn%())

下列子过程语句中正确的是 A.Sub f1(By Val()As Integer) B.Sub f1(n()As Integer)As Integer C.Function f1(f1 As Integer)As Integer D.Function f1(By Val f As Integer)

(33)下列子过程语句的说明正确的是A.Sub f1(By Val x()As Integer) B.Sub f1(X%())As IntegerC.Function f1l%(f1%) D.Function f1%(x As Integer)

(27)有下列两个过程: Sub S1(ByVal x As Integer,ByVal y As Integer) Dim t As Integer t=x x=y y=t End Sub Sub S2(x As Integer,y As Integer) Dim t As Integer t=x x=y y=t End Sub 则下列叙述中正确的是 A.用过程S1可以实现交换两个变量的值的操作,S2不能实现B.用过程S2可以实现交换两个变量的值的操作,S1不能实现 C.用过程S1和S2可以实现交换两个变量的值的操作 D.用过程S1和S2不能实现交换两个变量的值的操作

下面子过程说明合法的是( )。 A、Sub f1(ByVal n%())B、 Sub f1(%)As integerC、 Function f1%(f1%)D、 Function f1(ByVal n%)

若已知f1(t)的拉氏变换F1(s)=1/s,则f(t)=f1(t)的拉氏变换F(s)=()。

在窗体上画一个名称为Command1的命令按钮,然后编写如下事件过程:Privfite Sub Command1_Click()n=5f=1s=0For i=1 To nf=f 【 】s=s+fNextPtint SEnd Sub该事件过程的功能是计算s=1+2!+1/3!+...+1/n!的值。请填空。

设有如下程序: Private Sub Form. Click( ) Dim s As Long,f As Long Dim n As Integer,i As Integer f=1 n=4 For i=1 To n f=f*i s=s+f Next i Print s End Sub 程序运行后,单击窗体,输出结果是( )。A.32B.33C.34D.35

以下程序用于求S=1+3+32+33+…+310的值。Private Sub Commandl_Click()S=1T=1ForI=1 To 10T=______S=S+TNextIPrint"S=";SEnd Sub

现有如下程序: Private Sub Command1_Click() s=0 For i=1 To 5 s=s+f(5+i) Next Print s End Sub Public Function f(x As Integer) If x>=10 Then t=x+1 Else t=x+2 End If f=t End Function 运行程序,则窗体上显示的是( )。A.38B.49C.61D.70

下面子过程语句说明合法的是A.Sub f1(s1 As String*8)B.Sub f1(n()As Integer)As IntegerC.Function f1(f1 As Integer)As IntegerD.Function f1(By Val n As Integer)

下列子过程语句中正确的是( )。A.Sub f1(ByVal() As Integer)B.Sub f1(n() As Integer)As IntegerC.Function f1(f1 As Integer)As IntegerD.Function f1(ByVa1 f as Integer)

下面程序的输出结果是。 Private Sub Commandl_Click ch$=“ABCDEF” proc ch:Print ch End Sub Private Sub proc(ch As Stnng) s=“” For k=Len(ch) TO 1 Step -1 s=sMid(ch,k,1) Next k ch=s End Sub A.ABCDEF B.FEDCBA C.A D.F

在窗体中有一个名为run34的命令按钮,事件代码如下: Private Sub run34_Click( ) f1=1 f2=1 For n=3 T0 7 F=f1+f2 f1=f2 f2= f Next n MsgBox f End Sub 打开窗体,单击命令按钮,消息框的输出结果是( )。A.8B.13C.21D.其他结果

下面程序的运行结果是#include #define SIZE 12sub(char *a,int t1,int t2) { char ch; while(t1t2) { ch=*(a+t1); *(a+t1)=*(a+t2); *(a+t2)=ch; t1++;t2--; }} main() { char s[SIZE]={’A’,’B’,’C’,’D’,’E’,’F’,’G’,’H’,’I’,’J’,’K’,’L’}; int i; sub(s,7,SIZE-1); for(i=0;iSIZE;i++) printf("%c ",s[i]); printf("\n");}

下列程序运行后的输出结果是______。Private Sub f(k,s) s = 1 for j = 1 To k s=s*j Next jEnd SubPrivate Sub Command1_ Click () Sum = 0 for i = 1 To 3 Call f(i, s) Sum = Sum + s Next i Print Sum End SubA.0B.3C.6D.9

在窗体上画一个名称为Command1的命令按钮,然后编写如下事件过程:Privme Sub Command1_Click( )n=5f=1s=0For i=1 To nf=f【 】s=s+fNextPrint sEnd Sub该事件过程的功能是计算的值。请填空。

在窗体中有一个名为run34的命令按钮,事件代码如下:Private Sub run34_Click( )f1=1f2=1For n=3 T0 7F=f1+f2f1=f2f2= fNext nMsgBox fEnd Sub打开窗体,单击命令按钮,消息框的输出结果是( )。A.8B.13C.21D.其他结果

假定有以下两个过程: Sub SI (By Val x As Integer,By Val y As Integer) Dim t As Integer t=x x=y y=t End Sub Sub S2(x As Integer,y As Integer) Dim t As Integer t=x x=y y=t End Sub 则以下说法中正确的是______。A.用过程S1可以实现交换两个变量的值的操作,S2不能实现B.用过程S2可以实现交换两个变量的值的操作,S1不能实现C.用过程S1和S2都可以实现交换两个变量的值的操作D.用过程S1和S2都不能实现交换两个变量的俏的操作

在窗体上画一个名称为Command1的命令按钮,然后编写如下通用过程和命令按钮的事件过程: Private Function f(m As Integer) If m Mod 2 = 0 Then f = m Else f = 1 End If End Function Private Sub Command1_Click() Dim i As Integer s = 0 For i = 1 To 5 s = s + f(i) Next Print s End Sub 程序运行后,单击命令按钮,在窗体上显示的是A. 11B.10C.9D.8

下列子过程语句的说明正确的是( )。A.Sub f1(ByVal x()As Integer)B.Sub f1(x%())As IntegerC.Function f1%(f1%)D.Function f1%(x As Integer)

设有如下程序:Private Sub Form. Click( )Dim s As Long,f As LongDim n As Integer,i As Integerf=1n=4For i=1 To nf=f*is=s+fNext iPrint sEnd Sub程序运行后,单击窗体,输出结果是( )。A.32B.33C.34D.35

有如下程序: Private Sub Command1 Click() Dim a As Single Dim b As Single a=5:b=4 Call S(a,B)End Sub Sub S(x As Single,y As Single) t=x x=t\y y=t Mod y End Sub 在调用运行上述程序后,a和b的值分别为A.0 0B.1 1C.2 2D.1 2

若有如下程序: int s[3] [3]={'a','b','C','d','e','f','g','h','i'},*t; main() {t:(int*)malloc(sizeof(int)); sub(t,s); printf("%c\n",*t); } sub(int*p,int b[][3]) {*p=b[2][1]; } 则程序运行后的输出结果是( )。A.dB.eC.hD.b

下列程序运行后的输出结果是______。Private Sub f(k,s)s=1For j=1 To ks=s*jNextEnd SubPrivate Sub Command1_Click()Sum=0For i=1 To 3Call f(i,s)Sum=Sum+sNextPrint SumEnd Sub