带头结点的双向循环链表L为空的条件是()。A.L==NULLB.L->next==NULLC.L->prior==NULLD.L->next==L
带头结点的双向循环链表L为空的条件是()。
A.L==NULL
B.L->next==NULL
C.L->prior==NULL
D.L->next==L
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