为提高数据传输的可靠性,可采用“冗余校验”的方法;海明码是常用的方法之一。在此方法中

题型:单项选择题

问题:

为提高数据传输的可靠性,可采用“冗余校验”的方法;海明码是常用的方法之一。在此方法中,若要求能检测出所有的双位错,并能校正单位错,则合法码字集中的码距至少为 (127) 。若原始数据的字长为5位,则采用海明码时其校验位至少为 (128) 位。

对图1-22的图(a)所示系统,仅当部件1,部件2和部件3,全部正常工作时,系统才能正常工作。图中数字为各部件的可靠性,整个系统的可靠性近似为 (129) 。如果将部件2和部件3改成由两个器件构成,如图(b)所示,只要器件a和b中有一个正常就能使部件2正常工作,只要器件c和d中有一个正常就能使部件3正常工作。图中数字是各器件的可靠性,则部件2的可靠性是 (130) ,整个系统的可靠性近似为 (131)

130()

A.0.64

B.0.88

C.0.96

D.0.99

考点:计算机软件水平考试中级软件设计师软件设计师
题型:单项选择题

阅读理解。

     Never go into a supermarket hungry! This is a good piece of advice. If you go shopping for food before

lunchtime, you'll probably buy more than you plan to. Unfortunately, however, just this advice isn't enough

for consumers these days. Modern shoppers need an education in how and how not to buy things at the store.

First, you check the weekly newspaper ads. Find out the items that are on sale and decide if you really need

these things. In other words, don't buy anything just because it's cheaper than usual! "New and Improved!"

or "All Natural" on the front of a package influence you. Instead, read the list of ingredients (成分) on the

back. Third, compare prices; that is, you should examine the prices of both different brands and different

sizes of the same brand.

     Another suggestion for consumers is to buy ordinary items instead of famous brands. Ordinary items in

supermarkets come in plain packages. These products are cheaper because producers don't spend much money

on packing or advenising. The quality, however, is usually as good as the quality of well-known name brands.

In the same way, in buying clothes, you can often find high quality and low prices in brands that are not

famous. Shopping in discount clothing stores can help you save a lot of money. Although these stores aren't

very attractive, and they usually do not have individual dressing rooms, not only are the prices low, but you

can often find the same famous brands that you find in high-priced department stores.

     Wise consumers read magazine ads and watch TV commercials,but they do this with one advantage:

knowledge of the psychology behind the ads. In other words, well-informed consumers watch for information

and check for misinformation. They ask themselves questions:Is the advertiser hiding something in small print

at the bottom of the page? Is there any real information in the commercial, or is the advertiser simply showing

an attractive image? With the answers to these questions, consumers can make a wise choice.

1. Before you decide to buy things you should _____.

A. make sure whether they are on sale

B. consider if you really need them

C. examine the prices of different brands

D. read the words on the front of the package

2. The writer suggests consumers buy ordinary products because _____.

A. they come in plain packages

B. they are advertised on newspapers

C. they are both good and cheaper

D. the quality is better than that of famous ones

3. The main idea of the last paragraph is that _____.

A. ads and commercials sometimes tell lies

B. advertisers sometimes hide some information

C. good consumers never read ads and commercials

D. we should make good use of ads and commercials

题型:单项选择题

我国增值税条例规定,从国外进口的设备,其增值税按( )计算其应纳税额。

A.离岸价

B.到岸价

C.出厂价

D.组成计税价格

题型:单项选择题

企业管理部门使用的固定资产发生的下列支出中,属于收益性支出的是( )。

A.购入时发生的保险费

B.购入时发生的运输费

C.发生的日常修理费用

D.购入时发生的安装费用

题型:单项选择题

对施工单位已经落实的安全防护、文明施工措施,专业监理工程师应当及时审查并签认所发生的费用。

题型:单项选择题

()是在现代技术经济条件下,可以开采、加工、利用的矿物集合体。

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