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Dim s As Strings = "桐乡abc"If Len(s) >= 6 Then s = Mid(s, 3, 2) Else s = Mid(s, 1, 2)该程序段运行后s的值为()
A."桐乡abc
B."桐乡
C."ab
D."abc
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
B、"桐乡
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A."桐乡abc
B."桐乡
C."ab
D."abc
B、"桐乡
A.Strings="abc"
B.String[]s="abc"
C.Strings=newString("abc")
D.Strings=String"abc"
A.if((s!=null)&(s.length()>0))
B.if((s!=null)&&(s.length()>0))
C.if((s==null)||(s.length()==0))
D.if((s==null)|(s.length()==0))
A.classVechicle:publicBicycle
B.classBicycle:classVechicle
C.classBicycle:publicVechicle
D.classBicycle:publicclassVechicle
A.x、y和s都是成员变量
B.x是实例变量、y是类变量、s是局部变量
C.x和y是实例变量、s是参数
D.x、y和s都是实例变量
A.正确运行,输出:B
B.正确运行,输出:A
C.运行时引发异常
D.编译时发生错误
import java.applet.*;
import java.awt.*;
irnport javax.swing.*;
import java.awt.event.*;
public class C0601 extends Applet implements()
{
JPanel pan=new JPand();
Strings[]={"足球","排球","篮球","乒乓球"};
JCheckBox box[]=new JCeckBox[4];
JTextArea text=new JTextArea(6,20);
public void init()
{
setSize(400,150);
for(int i=0;i<4;i++)
{
box[i]=new JCheckBox(s[i]);
pan.add(box[i]);
box[i].addItemListener(this);
}
add(pan);
add(text);text.setBackground(Color.cyan);
}
public void itemStateChanged(ItemEvent e)
{
text.setText("你选择了:");
for(int i=0;i<4;i++)
if(box[i].())
text.setText(text.getText()+"/n"+box[i].getText());
}
}
A.只有下标为1、5、9的数组项被赋到值1、5、9
B.数组前三项值为1、5、9
C.只有下标为1、5、9的数组项被赋到值1、2、3
D.程序运行会出错
用二分法求函数f(x)=x^3-6x-1=0在x=2~5范围内的x=2附近的一个实根,其计算误差为|xl-x2|<10^(-6)。完善下列程序。
Private Sub Command1 _Click ()
Dim V0 As Singke, v As Single, s As String
Dim x As Single, t As Single, x1 As Single, x2 As Single
x1 =0: x2=5
Do While()
x = (x1 +x2)/2
If Sgn(f1 (x)) = 1 Then
x2 = x
Else
x1 = x
End If
Loop
Print "x = "; x
End Sub
Private Function f1 (x As Single) As Single
f1 = x * x * x -6 * x-1
End Function