winform控件縮寫（四）資料 序号 縮寫 空間名 1 dts DataSet 2 dgv DataGridView 3 bds BindingSource 4 bdn BindingNavigator 5
![mysql5.7的sql優化[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)