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【简答题】
若有以下两个过程: Sub S1(ByVal x As Integer, ByVal y As Integer) Dim t As Integer t = x x = y y = t End Sub Sub S2(x As Integer, y As Integer) Dim t As Integer t = x : x = y : y = t End Sub 则下列说法中,正确的是( )。 A. 使用过程 S1 可以交换调用函数中两个变量的值,S2 不能实现 B. 使用过程 S2 可以交换调用函数中两个变量的值,S1 不能实现 C. 过程 S1 和 S2 都可以实现交换调用函数中两个变量的值 D. 过程 S1 和 S2 都不能实现交换调用函数中两个变量的值
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