A:
B:
C:
D:
a(1)=False
For i = 2 To 20
a(i) = True
Next i
If a(i) = True Then
For j = 2 To 20 \ i
a(i * j) = False
Next j
End If
t = 0
For i = 1 To 20
t = t + 1
经过该程序段运行后,变量t的值为( )
常见的家用电器中,正常工作电流约为4A的是( )