A.x的值是数值3 B.x的值是字符"3" C.0是默认值 D.对话框标题是"求面积"
A.①② B.①③ C.②③ D.②④
A.20 B.14 C.4 D.2
A.MousePictrue B.Style C.DownPicture D.DisabledPicture
A、Dim B、Private C、Public D、Static
