著名的“哲学家就餐问题”是指:五位哲学家围圆桌就座,桌上每二人之间放一根筷子,任一位

题型:问答题

问题:

著名的“哲学家就餐问题”是指:五位哲学家围圆桌就座,桌上每二人之间放一根筷子,任一位哲学家修学中饿了便可且只能拿起左右两边的筷子吃饭,餐后将两根筷子各放回原处,自己也继续做学问,如此往复,即对哲学家Pi(i=0,1,2,3,4)有循环进程Si:
Pi做学问;
Pi取左手的i号筷子和右手的(i+1)rood 5号筷子;
Pi就餐;
Pi将两根筷子分放回原处;
哲学家就餐问题是这样5个进程组成的系统。

请分别用死锁预防、死锁避免、死锁检测与恢复改造系统。

考点:普通考研计算机学科专业基础综合考研操作系统
题型:问答题

中 * * 党领导下的按照“三三制”原则组成行政机关的是( )

A.工农民主 * *

B.抗日民主 * *

C.人民民主 * *

D.社会主义 * *

题型:问答题

中国书法史上,有诸多不朽的佳作足以彪炳千秋,其中被称为“天下第一行书”的书法作品是()。

A、王羲之《兰亭序》

B、米芾《蜀素帖》

C、苏轼《寒食诗帖》

D、颜真卿《祭侄文稿》

题型:问答题

阅读理解

     Almost every day we come across situations in which we have to make decisions one way or another. Choice ,we are given to believe, is a right. But for a good many people in the world,in rich and poor

countries, choice is a luxury , something wonderful but hard to get, not a right. And for those who think

th ey are exercising their right to make choices , the whole  system  is merely an illusion , a false idea

created by companies and advertisers hoping to sell their products.

     The endless choice gives birth to anxiety in people's lives. Buying something as basic as a coffee pot

is not exactly simple. Easy access to a wide range of everyday goods leads to a sense of powerlessness

in many people, ending in the shopper giving up and walking away, or just  buying  an  unsuitable  item

(商品) that is not really wanted. Recent studies in England have shown that many electrical goods bought

in almost every family are not really needed. More difficult decision-making is then either avoided or

trusted into the hands of the professionals ,lifestyle instructors , or advisors.

      It is not just the availability of the goods that is the problem, but the speed with which new types of

products come on the market. Advances in design and production help quicken the process. Products

also need to have a short lifespan so that the public can be persuaded to replace them within a short time. The typical example is computers , which are almost out-of-date once they are bought. This indeed makes selection a problem. Gone are the days when one could just walk with ease into a shop and buy one thing:  no choice, no anxiety.

1. What does the author try to argue in Paragraph l?     

A. The exercise of rights is a luxury.

B. The practice of choice is difficult.

C. The right of choice is given but at a price.

D. Choice and right exist at the same time.

2. Why do more choices of goods give rise to anxiety?     

A. Professionals find it hard to decide on a suitable product.

B. People are likely to find themselves overcome by business persuasion.

C. Shoppers may find themselves lost in the broad range of items.

D. Companies and advertisers are often misleading about the range of choice.

3. By using computers as an example, the author wants to prove that___________.  

A. advanced products meet the needs of people

B. products of the latest design flood the market

C. competitions are fierce in high-tech industry

D. everyday goods need to be replaced often

4. What is this passage mainly about?  

A. The variety of choices in modern society.

B. The opinions on people's right in different countries.

C. The problems about the availability of everyday goods.

D. The helplessness in purchasing decisions.

题型:问答题

可溶于碳酸钠水溶液的是

A.丹参醌Ⅰ
B.丹参醌ⅡA
C.丹参醌ⅡB
D.丹参新醌甲
E.隐丹参醌

题型:问答题

( )是组织设备采购工作的指导性文件,是项目计划在采购工作中的深化和补充。

A.设计计划

B.采购计划

C.制造计划

D.招标计划

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