输入圆的半径 r（可能为小数），则 r 定义正确的是（）。A:Dim r As Single B:Dim r As Integer C:Dim r As String D:Dim r As Long 答案: Dim r As Single

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输入圆的半径 r（可能为小数），则 r 定义正确的是（ ）。A:Dim r As Single B:Dim r As Integer C:Dim r As String D:Dim r As Long 答案: Dim r As Single