以下程序:PublicSubSwap1(ByValxAsInteger,ByValyAsInteger)DimtAsIntegert=x:x=y:y=tEndS

以下程序：

PublicSubSwap1(ByValxAsInteger,ByValyAsInteger)

DimtAsInteger

t=x:x=y:y=t

EndSub

PublicSubSwap2(xAsInteger,yAsInteger)

DimtAsInteger

t=x:x=y:y=t

EndSub

PrivateSubCommand1_Click()

DimaAsInteger,bAsInteger

a=10:b=20

Swap1a,b

Print"A1=";a,"B1=";b

a=10:b=20

Swap2a,b

Print"A2=";a,"B2=";b

EndSub

当单击命令按钮后，窗体上输出的结果是( )

A.A1=20B1=10A2=10B2=20

B.A1=10B1=20A2=20B2=10

C.A1=10B1=20A2=10B2=10

D.A1=20B1=20A2=20B2=10