语法分析方法大体上可分成自顶向下和自底向上两种。自底向上分析法,是从输入符号串开始逐

题型:单项选择题

问题:

语法分析方法大体上可分成自顶向下和自底向上两种。自底向上分析法,是从输入符号串开始逐步进行 (1) ,直至 (1) 成文法的起始符号。自顶向下分析法,则是从文法的起始符号开始反复使用产生式进行 (2) ,直至 (3) 出输入符号串。

算符优先文法是一种自底向上分析方法,其特点是文法的产生式中 (4) 。自顶向下的分析方法,通常要求文法的产生式 (4) ,如 (5) 文法就是一种可以自顶向下分析的文法。

3()

A.不含两个相邻的非终结符

B.不含两个相邻的终结符

C.不含ε产生式

D.不含长度为1的产生式

考点:计算机软件水平考试中级数据库系统工程师数据库系统工程师
题型:单项选择题

足少阳胆经的络穴是()

A.足临泣

B.丘墟

C.悬钟

D.光明

E.阳陵泉

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My friend Matt and I arrived at the Activity Centre on Friday evening. The accommodation wasn't wonderful,but we had everything we needed(beds,blankets,food),and we were pleased to be out of the city and in the fresh air.

 On Saturday morning we met the other ten members of our group. Cameron had come along with two friends,Kevin and Simon,while sisters Carole and Lynn had come with Amanda. There were some other members I didn't know. We had come from different places and none of us knew the area.

 We knew we were going to spend the weekend outdoors,but none of us was sure exactly how. Half of us spent the morning caving while the others went rock-climbing and then we changed at lunchtime. Matt and I went to the caves(岩洞) first. Climbing out was harder than going in,but after a good deal of pushing, we were out at last. Though we were covered with mud,we were pleased and excited by what we'd done.

根据短文内容,选择正确答案。

小题1: The writer spent the Saturday morning _____.

A.rock-climbing

B.sleeping

C.meeting friends

D.caving小题2:There were _____ members in all in the writer's group.

A.6

B.8

C.l0

D.12小题3:We can learn from the passage that _____.

A.some of the group had been there before

B.the group had done rock-climbing many times

C.some of the group already knew each other

D.group all came from the same city小题4:The write thought her weekend was _____.

A.interesting

B.relaxing

C.frightening

D.unpleasant小题5:This passage mainly talks about ____.

A.the writer's friends at the Activity Centre

B.the writer's experience at the Activity Centre

C.outdoor sports at the Activity Centre

D.how to go rock-climbing and caving

题型:单项选择题

戒日帝国时印度的地租率为()

A.五税其一

B.六税其一

C.八税其一

D.十税其一

题型:单项选择题

简述幼儿园卫生保健管理的任务。

题型:单项选择题

《五国海军条约》

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