●带头结点的单链表head为空的判断条件是 (43) 。(43) A.head=NULLB.head-next=NULLC.head-next=headD.headNULL

●带头结点的单链表head为空的判断条件是 (43) 。

(43) A.head=NULL

B.head->next=NULL

C.head->next=head

D.head<>NULL


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