【单选题】【消耗次数：1】
在一个链表中，每个结点必然存在着一个指向自身结点类型的指针域，用来保存下一个结点的（ ）。
①
地址
②
值
③
名称
④
类型
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在一个尾指针为rear的不带头结点的单循环链表中,插入一个s所指的结点,并作为第一个结点，可执行( ).
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【单选题】
在一个尾指针为rear的不带头结点的单循环链表中,插入一个s所指的结点,并作为第一个结点，可执行（ ）。
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