（多选题）
Which three statements describe the functionality of the DO_KEY built-in?（）
AIt accepts both a built-in and a key name as argument.
BIf no key trigger is defined, the specified built-in executes.
CIts parameter must be specified in upper case, enclosed in single quotation marks.
DIt performs the same task as if you pressed the function key associated with the specified argument.
EIt executes the key trigger that corresponds to the built-in specified as its parameter.
正确答案
答案解析
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