A.Dima As String B.String a C.Const a=3.14 D.Dim a=3.14 as single
A.x<0 or x>10 B.x<0 and x>10 C.x>0 and x<10 D.not x<0 and x>10
A.名稱 B.標題 C.索引 D.有效