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已知广义表a=((a,b,c),(d,e,f)),从a中取出原子e的运算是( )。

单选题
2021-07-17 18:51
A、tail(head(a))
B、head(tail(a))
C、head(tail(tail(head(a))))
D、head(tail(tail(a)))
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正确答案
D

试题解析

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