A.ALTER DATABASE BACKUP CONTROLFILE TO TRACE B.ALTER DATABASE BACKUP CONTROLFILE TO BACKUP C.ALTER DATABASE BACKUP CONTROLFILE TO ‘filename’ D.ALTER DATABASE BACKUP CONTROLFILE TO TEXT ‘filename’
A.客戶可能選擇了其他賬戶進(jìn)入系統(tǒng) B.圖標(biāo)可能被誤刪除 C.“顯示桌面圖標(biāo)”選項(xiàng)沒(méi)有勾上 D.中毒的可能性最大
A.3.3V和5V B.僅5V C.5V和12V D.僅12V