设r1、r2和L1、L2分别是变压器一、二次绕组的电阻和自感,M是其互感,则理想变压器的条件是()。
第1题:
在窗体中添加一个名称为Command1的命令按钮,然后编写如下程序: Public x As Integer Private Sub Command1_Click() x=10 Call s1 Call s2 MSgBox x End Sub Private Sub s1() x=x+20 End Sub Private Sub s2() Dim x As Integer x=X+20 End Sub 窗体打开运行后,单击命令按钮,则消息框的输出结果为______。
A.10
B.30
C.40
D.50
第2题:
假定一个工程由一个窗体文件Form1和两个标准模块文件Model1及Model2 组成。 Model1代码如下: Public X As Integer Public Y As Integer Sub S1( ) x=1 S2 End Sub Sub S2( ) y=10 Form1.Show End Sub Model2的代码如下: Sub Main( ) S1 End Sub 其中Sub Main被设置为启动过程。程序运行后,各模块的执行顺序是( )。
A.Form1→Model1→Model2
B.Model1→Model2→Form1
C.Model2→Model1→Form1
D.Model2→Form1→Model1
第3题:
在窗体上画一个命令按钮和两个文本框,其名称分别为Command1、Text1和Text2,然后编写如下程序: Dim S1 As String,S2 As String Private Sub Form_Load() Text1.Text="" Text2.Text="" End Sub Private Sub Text1_KeyDown(KeyCode As Integer,Shift As Integer) S2=S2 & Chr(Keycode) End Sub Private Sub Text1_KeyPress(KeyAscii As Integer) S1=S1 & Chr(KeyAscii) End Sub Private Sub Command1_Click() Text1.Text=S2 Text2.Text=S1 S1="" S2="" End Sub 程序运行后,在Text1中输入“abc”,然后单击命令按钮,在文本框Text1和Text2中显示的内容分别为______。
A.abc和ABC
B.abc和abe
C.ABC和abc
D.ABC和ABC
第4题:
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 0
B.1 1
C.2 2
D.1 2
第5题:
编写如下事件过程: Private sub sub1 (ByVal x1 As String, y1 As String) Dim xt As String Dim i As Integer i = Len(x1) Do While i>= 1 xt = xt + Mid(x1, i, 1) i=i-1 Loop y1 = xt End Sub Private Sub Form. Click() Dim s1 As String, s2 As String s1= "teacher" sub1 s1, s2 Print s2 End Sub 程序运行后,单击窗体,则窗体上显示的内容是
A.rehcaet
B.tahreee
C.themee
D.eerthea
第6题:
在窗体中添加一个标签LblResult和一个命令按钮Command1,然后编写程序。程序的功能是单击命令按钮,计算1+2+3+4+5的值,并把结果转化为字符串显示在标签内,能够实现上述功能的程序段是, ( )
A.Private Sub Command1_Click() Dim I,R As Integer For I=1 To 5 Step 1 R=R+I Next LblResult. Name=Str$ (R) End Sub
B.Private Sub Command1_ClickO Dim I,R As Integer For I=1 To 5 Step 1 R=R+I Next LblResult. Caption= Str$ (R) End Sub
C.Private Sub Command1_Click() Dim I,R As Integer Do While I<5 R=R+I I=I+1 Loop LblResult. Caption=Str$ (R) End Sub
D.Private Sub Command1_Click() Dim I,R As Integer Do R=R+I I=I+1 Loop While I<5 LblResult. Caption=Str$ (R) End Sub
第7题:
【程序说明】 计算下列算式的值。a,Ai为正整数,从键盘输入。其小∑Ai=1+2…+ Ai,Ai!=1 *2*3*Ai(i=1,2… a)。
【程序】
SET TAIK OFF
CLEAR
INPUT“M=”TO M
STORE 0 TO S1,S2
FOR I=1 TO M
(8)
DO SUB1
DO SUB2
ENDFOR
? ” 所求算式的值为:“+ALLTRIM(STR(S1/S2,15,3))
SET TALK ON
PROCEDURE SUB1
(9)
FOR R=1 TO A
K=K+R
ENDFOR
(10)
RETURN
PROCEDURE SUB2
(11)
FOR P=1 TO A
T=T*P
ENDFOR
(12)
RETURN
(8)
A.INPUT“A=”TO A
B.INPUT“I=”TO I
C.INPUT“R=”TO STR(R)
D.INPUT“K=”TOK
第8题:
A、Sub plus(sum, a , b ): sum = a + b: End Sub
B、Sub plus(ByVal sum , a , b ): sum = a + b: End Sub
C、Sub plus(sum , ByVal a, ByVal b ): sum = a + b: End Sub
D、Sub plus(sum , ByRef a , ByRef b ): sum = a + b: End Sub
第9题:
写出程序运行的结果
Public class Base
Public virtual string Hello() {return “Base”;}
Public class Sub:Base
Public override string Hello() {return “Sub”;}
1. Base b = new Base(); b.Hello;
2. Sub s = new Sub(); s.Hello;
3. Base b = new Sub (); b.Hello;
4. Sub s = new Base(); s.Hello;
第10题:
A. :r/^#//g
B. :1,$ s/^#//g
C. :sed s/^#//g
D. :sub s/^#//g