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Which three scenarios describe appropriate uses for key triggers?（）
A:Alter data in a database table. 
B:Add custom item validation code. 
C:Disable the Next Block key and menu item. 
D:Display a custom form in place of a List of Values. 
E:Change the navigational order of the blocks in a form. 
F:Perform a complex calculation each time the F10 key is pressed. 

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出自：Oracle认证

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