题目内容
若用带头结点的单链表st来表示链栈，则栈空的标志是st->next==NULL。
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若用不带头结点的单链表st来表示链式栈，则创建一个空栈所要执行的操作是st==NULL。
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Dear Professor Dannie,Please allow me to （1） __________________ （介绍我的朋友）, Li Mei, to you. She is applying for admission to your university now and I believe she will achieve a lot if she is accepted by the major of （2） _____________________ (国际贸易) in your college. Miss. Li is good at English and she has passed IELTS and （3） _________________(他的总分是7分). And any testing mark is more than 6, which means she satisfies all the foreign language requirements. She is a （4） __________________________ (诚实、勤劳) young student.Thank you very much for your consideration. My friend and I （5） _____________________________ (盼望您的回信) soon.Yours truly,Li Shu
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