单项选择题
You created a custom menu for the Order Entry application. The shipping administrator has requested an additional submenu containing four items to invoke various reports. Which command type must you use to identify the parent menu item as a submenu? （）
A.Menu B.Plus C.Macro D.PL/SQL
单项选择题 Whichbuilt-inallowsyoutoupdatethescreendisplaytoreflecttheinformationthatFormshasinitsinternalrepresentationofthescreen?（）
单项选择题 Howcanyoumodifytheapplicationtoreturnmoremeaningfulerrormessagestotheuser?（）
单项选择题 Whenarepeatingtimerexpires,（）.
