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【单选题】
设栈S的初始状态为空,现有5个元素组成的序列{1,2,3,4,5},对该序列在S栈上依次进行如下操作(从序列中的1开始,出栈后不再进栈):进栈、进栈、进栈、出栈、进栈、出栈、进栈。试问出栈的元素序列是( )。A.
{5,4,3,2,1}
B.
{2,1}
C.
{2,3}
D.
{3,4}
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A.
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B.
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