s=Text 1.Text:n=0:f=False
For i=1 To Len(s)
ch=Mid(s,i,1)
If ch>="0" And ch<="9" Then
If Not f Then
f=True:n=n+1
End If
Else
f=False
End If
Next i
运行该程序段后,在文本框Text 1中输入“13+(123-23) *2”则变量n的值为( )
测试该场景时,“地球”实例放置在图层8中,“图层8”图层的内容无法看到,最有可能的原因是( )
L = 0: R = 7: i = 1
Do While i < R
If a(i) = 0 Then
L = L + 1
t = a(i): a(i) = a(L): a(L) = t i = i + 1
ElseIf a(i) = 2 Then
R = R - 1
t = a(i): a(i) = a(R): a(R) = t
Else
i = i + 1
End If
Loop
数组元素 a(1)到 a(6)的值依次为“2,0,2,1,1,0”。执行该程序段后,下列说法不正确的是( )
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若用Excel图表来体现各学历水平分布的比例,较合适的图表类型是( )
For i=2 To n
k=a(i):j=j-1
Do While k<a(i)
a(j+1)=a(j)
j=j-1
If j=0 Then Exit Do
Loop
Next i
要实现上述排序算法,方框内VB语句应为( )
import matplotlib.pyplot as plt
import numpy as np
# numpy. linspace(start, stop, num=50)
#产生从start到stop的等差数列,num为元素个数,默认50个
x = np.linspace(0, 1, 50)
y1=x**2
y1=**2
y2 = np.sqrt(x)
y3=x**5
plt.figure( )
①
②
③
plt.legend( )
plt.show( )