单项选择题
A.将窗体的Caption设成空字符 B.将窗体的Enabled属性置成False C.将窗体的BorderStyle置成None D.将窗体的ContalBox置成False
A.Command1.Enabled=True B.Command1.Enabled=False C.Command1.Visible=True D.Command1.Visible=False
A.14 B.20 C.25 D.29