A.sp1->num head NULL
B.sp2->num sp1 NULL
C.sp2->num sp2 sp1
D.sp1->num head sp1
第1题
A.HEAD= =NULL
B.HEAD-〉NEXT= =NULL
C.HEAD-〉NEXT= =HEAD
D.HEAD!=NULL
第3题
A.head = = NULL;
B.head->next = = NULL;
C.head->next = = head;
D.head! = NULL;
第4题
A.head->next==NULL
B.head==NULL
C.head->next==head
D.head!=NULL
第6题
A.head = = NULL;
B.head->next = = NULL;
C.head->next = = head;
D.head! = NULL;
第8题
A.head==NULL
B.head->next==NULL
C.head->next==head
D.head!=NULL
第10题
A.head == NULL
B.head == NULL
C.head -> prior == head
D.head -> next == head
第11题
A.head==NULL
B.head→next==NULL
C.head→next==head
D.head!=NULL
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