SAS 数据集复制语句的基本格式: DATA 数据集名 ; SET 数据集名(数据集选择项 IN= 变量名)( SET 语句选择项) ; [DROP 变量名列表 ;] [KEEP 变量名列表 ;] ; 其中 保留部分变量功能的语句为:( )
A.
DATA
B.
SET
C.
DROP
D.
KEEP
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