未知题型
在窗体上画一个命令按钮，然后编写如下程序：Sub S1(ByVal x As Integer, By Val y As Integer) Dim t As Integer t=x x=y y=tEnd SubPrivate Sub Command1_ Click() Dim a As Integer, b As Integer a=10 b=30 S1 a，b Print 'a='；a='b='；bEnd Sub 程序运行后，单击命令按钮，输出结果是______。
A.a=30 b=10
B.a=30 b=30
C.a=10 b=30
D.a=10 b=10
- A.a=30
B.a=30
C.a=10
D.a=10
【参考答案】
C
解析：过程S1似乎是要将两个变量的值进行交换，但由于参数是用传值的方式来传递变量值的，所以执行完该过程后，a......
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