题目内容

向一个栈顶指针为hs的链栈中插入一个s结点时，应执行（）。

A. hs->next=s;
B. S->next=hs;hs=s;
C. S->next=hs->next;hs->next=s;
D. S->next=hs;hs=hs->next;

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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。

A. 对
B. 错

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。

A. 对
B. 错

下列分子中,所有原子均在同一平面的是

A. 甲烷
B. 乙烷
C. 乙烯
D. 丙烯

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