单项选择题
A.t->prior->next=t->next;t->next->prior=t->prior; B.t->prior->prior=t->prior;t->next->next=t->next; C.t->prior->next=t->prior;t->next->prior=t->next; D.t->prior->prior=t->next;t->next->prior=t->prior;
A.无向图 B.AOV网 C.AOE网 D.有向图
A.E2 B.N2 C.N2-E2 D.N2+E2