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数据结构导论 > 设字符串S1=″ABCDEFG″，S2=″PQRST″，则运算S=CONCAT(SUBSTR(S1,2,LENGTH(S2)),SUBSTR(S1,LENGTH(S2),2))后S的结果为()
设字符串S1=″ABCDEFG″，S2=″PQRST″，则运算S=CONCAT(SUBSTR(S1,2,LENGTH(S2)),SUBSTR(S1,LENGTH(S2),2))后S的结果为()
A.″BCQR ″
B.″BCDEF ″
C.″ BCDEFG ″
D.″BCDEFEF ″
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正确答案： D 答案分析：无
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