以下关于 WinForms 窗体的方法错误的说法是（）

A. ExecuteNonQuery()

B. ExecuteReader()

C. ExecuteScalar()

D. SelectAll()

A. string str = "Tom＼＇s Living Room";

B. string str = "Tom＇s Living Room";

C. string str("Tom＇s Living Room");

D. string str("Tom"s Living Room");

A. Close()方法为关闭窗体

B. Show()方法为显示窗体

C. ShowDialog()方法为显示模式窗体

D. Hide()方法为卸载窗体

A. 123

B. 321

C. 132

D. 213

A. select * from student where cardno like ＇010%＇ or cardno like ＇020%＇

B. select * from student where cardno like ＇010%＇ or ＇020%＇

C. select * from student where cardno like ＇0[1,2]0%＇

D. select * from student where cardno like ＇0(1,2)0%＇

A. DataSet

B. DataTable

C. DataView

D. Command

A. CheckBox

B. RadioButton

C. ComboBox

D. ListBox

A. 0

B. 3

C. 4

D. 12

A. 数据访问层

B. 业务逻辑层

C. 表示层

D. 数据传输层

A. GROUP BY

B. AVG

C. INNER JOIN

D. SUM