例输入百分制成绩mark,显示对应的五级制成绩 方法一 方法二s 方法三 Select case mark Select case mark Select case mark Case mark >=90 Case Is >=90 Case Is >=90 Case mark≥=70 Print"优" Print"优" Print"优 Case mark >=80 ase Is >=80 Case 80 To 89 Print"良n Pint"良"冲 Print"良" Case Is >=70 Case 70 To 79 Print"中" Print"中 Print"中" Case mark >=60 Case is > 60 Case 60 To 69 Print"及格" Print"及格" Print"及格" Case else Case else Case Else Print"不及格 Print"不及格" Print"不及格" End select J-7ys 7aicsrsiy End Select End select u 哪些能实现,哪些不能实现?例 输入百分制成绩mark，显示对应的五级制成绩 方法一 方法二 方法三 Select Case mark Select Case mark Select Case mark Case mark >= 90 Case Is >= 90 Case Is >= 90 Print "优" Print "优" Print "优" Case mark >= 80 Case Is >= 80 Case 80 To 89 Print "良" Print "良" Print "良" Case mark >= 70 Case Is >= 70 Case 70 To 79 Print "中" Print "中" Print "中" Case mark >= 60 Case Is >= 60 Case 60 To 69 Print "及格" Print "及格" Print "及格" Case Else Case Else Case Else Print "不及格" Print "不及格" Print "不及格" End Select End Select End Select 哪些能实现，哪些不能实现？