有下列两个过程: Sub S1(By Val x As Integer, By Val 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 则下列叙述中正确的是( )。
A.
用过程S1可以实现交换两个变量的值的操作,S2不能实现
B.
用过程S2可以实现交换两个变量的值的操作,S1不能实现
C.
用过程S1和S2都可以实现交换两个变量的值的操作
D.
用过程S1和S2都不能实现交换两个变量的值的操作
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A.
special tariffs
B.
environmental protection laws
C.
world oil, currency, and labor markets
D.
legislation on equal employment
E.
population changes by race, age, sex, and level of affluence
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