单项选择题
VB中，定义a为实型变量的语句是（）。
A.Dim a As Integer
B.Dim a As Single
C.Dim a As Date
D.Dim a As Byte
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单项选择题
A.Dim a As Integer
B.Dim a As Single
C.Dim a As Date
D.Dim a As Byte
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