光信号能够在光纤中以极低的损耗传输，是利用了光纤的（）原理。
A.反射
B.折射
C.全反射
D.透射
参考答案：C
用于治疗血虚便溏时应首选（）
A.酒炙当归
B.油炙当归
C.土炒当归
D.当归炭
E.当归头
窗体上有4个文本框控件数组text1()和一个命令按钮，程序运行前如左图所示，程序运行后如右图所示。给定的程序不完整，将程序补充完整。
Dim x(3)As Integer Private Sub Command1_Click ()For i = 0 To 3 x(i)= 【10】 Next iFor i = 0 To UBound(x)- 1 For j = i To UBound(x) If 【11】 Then t = x(i) x(i)= x(j)x(j)= t End If Next j Next i For i = 0 To 3 Text1(i) .Text = Str(x(i)) Next iEnd Sub
Dim x(3)As Integer Private Sub Command1_Click ()For i = 0 To 3 x(i)= 【10】 Next iFor i = 0 To UBound(x)- 1 For j = i To UBound(x) If 【11】 Then t = x(i) x(i)= x(j)x(j)= t End If Next j Next i For i = 0 To 3 Text1(i) .Text = Str(x(i)) Next iEnd Sub