架空线路的同一横担上,L1、L2、L3、N、PE五条线的排列次序是面向负荷侧从左起依次为()A、L1、L2、L3、N、PEB、L1、N、L2、L3、PEC、L1、L2、N、L3、PED、PE、N、L1、L2、L3

架空线路的同一横担上,L1、L2、L3、N、PE五条线的排列次序是面向负荷侧从左起依次为()

  • A、L1、L2、L3、N、PE
  • B、L1、N、L2、L3、PE
  • C、L1、L2、N、L3、PE
  • D、PE、N、L1、L2、L3

相关考题:

有以下程序:Private Sub Form_Activate()For j=1 to 3x=3For i=l to 2x=x+6NextNextPrint xEnd Sub程序运行后,窗体上显示的结果为______。

在窗体上画两个标签和一个命令按钮,其名称分别为Labell、Label2和Command1,然后编写如下程序: Private Sub func(L As Label,ByVal a As Integer) L.Caption="1234" a=a*a End Sub Private Sub Form_Load() Label1.Caption="ABCD" Label2.Caption=10 End Sub Private Sub Command1_Click() a=Val(Label2.Caption) Call func(Labell,A)Label2.Caption=a End Sub 程序运行后,单击命令按钮,在两个标签Label1和Label2中显示的内容分别是 ______。A.ABCD和10B.1234和100C.ABCD和100D.1234和10

在通用声明中定义a,在窗体中添加一个命令按钮Command1,编写如下程序代码:DimaAsIntegerSubtest()a=a+1:b=b+1:c=c+1PrintSub:;a;,;b;,;cEndSubPrivateSubCommand1_Click()a=2:b=3:c=4CalltestCalltestEndSub程序运行后,单击命令按钮,窗体中将显示( )A.Sub:3,4,5Sub:4,5,6B.Sub:2,3,4Sub:2,3,4C.Sub:3,1,1Sub:4,1,1D.Sub:1,1,1Sub:1,1,1

运行以下程序后,输出结果为_____________。 Private Sub Command1_Click() a=1:b=2:c=3 Call test(a,b+3,(c)) Print "main:";a;b;c End Sub Private Function test(p,m,n) p=p+1:m=m+1:n=n+1 Print "sub:";p;m;n End Function:A. sub:2 6 4 main:1 2 3B. sub:2 6 4 main:2 2 3C. sub:2 6 4 main:2 6 4D. sub:2 6 4 main:1 6 4

架空线路中,当动力、照明线路在同一横担上时,导线相序排列是:面向负荷从左侧起依次为()。 A、L1L2L3NPEB、L1L2L3PENC、L1NL2L3PED、L1L2NL3PE

如下图所示的两个窗体:要使其中第一个窗体中的第一个命令按钮来控制显示第二个窗体,第二个命令按钮用来结束程序的运行(两个按钮名称为Command1和Command2)。则以下选项中,对这两个命令按钮编写的事件过程正确的是A.Private Sub Command1 Click() Form2.Show 1 End Sub Private Sub Command2_Click()End End SubB.Private Sub Command1_Click() Show 1 End Sub Private Sub Conunand2_Click() End End SubC.Private Sub Conmmand1_Click() Show 1 End Sub Private Sub Command2_Click() End End SubD.Private Sub Command1_Click()Show 1, Form2 End SubPrivate Sub Command2_Click() End End Sub

执行下列程序,输入框中显示的默认字符串为上【 】:Private Sub Command l_Click ()Input Box”ok”“输入参数”,Format(”GHl2”’End Sub

有如下程序: Private Sub Command1_Click() Dim a As Single Dim b As Single a=5:b=4 Call Sub1(a,b) End Sub Sub Sub1(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

在窗体上画两个标签和一个命令按钮,其名称分别为Label1、Label2和Command1,然后编写如下程序: Private Sub func(L As Label,ByVal a As Integer) L.Caption="1234" a=a*a End Sub Private Sub Form_Load() Label1.Caption="ABCD" Label2.Caption=10 End Sub Private Sub Command1_Click() a=Val(Label2.Caption) Call func(Label1,A)Label2.Caption=a End Sub 程序运行后,单击命令按钮,在两个标签Label1和Label2中显示的内容分别是: ______。A.ABCD和10B.1234和100C.ABCD和100D.1234和10

下列程序的输出结果是【 】。Private Sub Command l Click()Dim a(1 TO 20)Dim iFor i=1 TO 20a(i)=iNext iFor Each i In a()a(i)=20Next iPrint a(2) End Sub

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: Private Sub Command1_Click() Call sub1(-15.1,2.54) End Sub Public Function sub1(a As Integer,ByVa1 b As String) As Integer a=Val(B)sub1=a Print sub1 End Function 程序运行后,单击命令按钮,在窗体上输出的是A.3B.2C.-15D.提示出错

在窗体中添加一个命令按钮,编写如下程序: Private Sub Test(p,m,n) p=p+1:m=m+1:n=n+1 Print "Sub: ";p;m;n End Sub Private Sub Command1.Click() a1=1:b=2:c1=3 Call Test((a,b1+3,(c1)) Print "Main:";a1;b1;c1 End Sub 程序运行后,输出结果为A.Sub: 2 6 4 Main: 2 6 4B.Sub: 2 6 4 Main: 2 6 4C.Sub: 2 6 4 Main: 1 2 3D.Sub: 2 6 4 Main: 2 2 3

在窗体中添加一个命令按钮,编写如下程序:Private Sub Sub1(p,m,n)p=p+1:m=m+1:n=n+1Print "sub1:";p;m;nEnd SubPrivate Sub Command1_Click()a1=1:b=2:c1=3Call Sub1(a,b1+3,c1)Print"Main:";a1;b1;c1End Sub程序运行后,输出结果为A.Sub: 2 6 4 Main: 2 6 4B.Sub: 2 6 4 Main: 2 6 4C.Sub: 2 6 4 Main: 1 2 3D.Sub: 2 6 4 Main: 2 2 3

在窗体上画了两个按钮控件Command1和Command2,有如下程序: Private Sub Command1_Click() Print "Visual"; End Sub Private Sub Command2_Click() Print "Basic"; End Sub Private Sub Form_Load() CommandCancel=True Command1.Cancel=True End Sub 执行程序后,按键盘Cancel键,在窗体上输出的结果是A.BasicB.VisualC.CancelD.True

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: Private Sub sub1(ByVal x As Integer, ByVal y As Integer, ByVal z As Integer) z=x * x+ y * y End Sub Private Sub Command1_Click() Dim a As Integer a = 8 Call sub1(1, 2,A)Print a End Sub 程序运行后,单击命令按钮,则窗体上显示的内容是A.8B.2C.5D.11

若要在子过程Proc l调用后返回两个变量的结果,下列过程定义语句中有效的是( )。A.Sub Proc1(n,m)B.Sub Proc1(By Val n ,m)C.Sub Proc1(n, By Val m)D.Sub Proc1 (By Val n,By Val m)

在窗体中添加一个命令按钮,编写如下程序: Private Sub Sub1(p,m,n) p=p+1:m=m+1:n=n+1 Print "sub1:";p;m;n End Sub Private Sub Command1_Click() a1=1:b=2:c1=3 Call Sub1(a,b1+3,c1) Print"Main:";a1;b1;c1 End Sub 程序运行后,输出结果为A.Sub: 2 6 4 Main: 2 6 4B.Sub: 2 6 4 Main: 2 6 4C.Sub: 2 6 4 Main: 1 2 3D.Sub: 2 6 4 Main: 2 2 3

当双击窗体Form1时,要将窗体Form1隐藏起来、将窗体Form2以模式方式显示出来的事件过程,正确的是A.Private Sub Form. _ Db1Click( ) Forml.Hide Form2.Show 0 End SubB.Private Sub Form. _ Db1Click( ) Form1.Hide Form. 2.Show 1 End SubC.Private Sub Form. _ Click( ) Form. l.Hide Form. 2.Show End SubD.Private Sub Form. _ Dbl Click( ) Form. l.Enabled=False Form. 2.Enabled=True End Sub

class Super {  public int i = 0;  public Super(String text) {  i = 1; }  }  public class Sub extends Super {  public Sub(String text) {  i = 2;  }   public static void main(String args[]) {  Sub sub = new Sub(“Hello”);  System.out.println(sub.i);  }  }  What is the result?()  A、 0B、 1C、 2D、 Compilation fails.

设当前目录是根目录,使用第()组命令不能在一级子目录SUB1下建立二级子目录SUB11。A、CD SUB1(回车)MD SUB11B、MD SUB1/SUB11C、MD SUB11D、MD/SUB1/SUB11

单选题变直径圆管流,细断面直径d1,粗断面直径d2=2d1,粗细断面雷诺数的关系是( )。ApResub1/sub=0.5Resub2/sub/pBpResub1/sub=Resub2/sub/pCpResub1/sub=1.5Resub2/sub/pDpResub1/sub=2Resub2/sub /p

单选题class Super {  public int i = 0;  public Super(String text) {  i = 1; }  }  public class Sub extends Super {  public Sub(String text) {  i = 2;  }   public static void main(String args[]) {  Sub sub = new Sub(“Hello”);  System.out.println(sub.i);  }  }  What is the result?()A 0B 1C 2D Compilation fails.

单选题永续盘存法公式为()AKsubt/sub+1=Isubt/sub-(1-δ)Ksubt/subBKsubt/sub+1=It+(1-δ)Ksubt/subCKsubt/sub+1=Isubt/sub+(1+δ)Ksubt/subDKsubt/sub+1=Isubt/sub-(1+δ)Ksubt/sub

单选题A pIsub2/sub=Isub3/sub/pB pIsub2/sub=4Isub3/sub/pC pIsub2/sub=2Isub3/sub/pD pIsub3/sub=4Isub2/sub/p

多选题下列表示中____的表示形式是正确的。ApUsub95/sub= 1%,vsubeff/sub =9 /pBpUsubr/sub= 1%,k=2 /pCpusubC/sub=0. 5% /pDpusubC/sub=±0 5%.k=1 /p

单选题若声压级相同的n个声音叠加,即L1=L2=…=Li……=Ln,则总声压级比L1增加了()dB。Ap10igLsub1/sub /pBplgLsub1/sub /pC10lgnDnlg10

多选题在过程控制中,若TL=-3,Tu=3,u=1,σ=1,则(  )。ACsubP/sub=1 BCsubP/sub=2/3 CCsubPk/sub=1 DCsubPk/sub=2/3

单选题( )被称为广义货币。ApMsub0/sub/pBpMsub1/sub/pCpMsub2/sub/pDpMsub3/sub/p