下列各组热化学方程式(同温、同压下)中大于(、为热量的数值)的是() ①②③④A

题型:选择题

问题:

下列各组热化学方程式(同温、同压下)中大于为热量的数值)的是(  )

A.①②               B.③④              C.②④              D.①③

考点:焓变、反应热中和热燃烧热
题型:选择题

施工组织设计编制完成后,应报请()审批。

A、企业负责人;

B、企业主要技术负责人;

C、项目负责人;

D、项目技术负责人.

题型:选择题

汽油机若有着火征兆或者着火后又渐渐熄火,一般属()。

A.起动系故障

B.油路故障

C.电路故障

D.综合故障

题型:选择题

工作中应时刻注意站在平衡()的位置,作业时应站在牢固的架子上。

A.吊物

B.放臵

C.安全

D.登高

题型:选择题

Several years ago, at the height of the dotcom boom, it was widely assumed that a publishing revolution, in which the printed word would be supplanted by the computer screen, was just around the corner. It wasn’t: for many, there is still little to match the joy of reading a printed book and settling down for one hour. But recently some big technology companies, including Google, Amazon, Microsoft and Yahoo, contend that the dream of bringing books online is still very much alive.

The digitizing of thousands of volumes of print is not without controversy. On Thursday, Google, the world’ s most popular search engine, posted a first installment of books on Google Print. This collaborative effort between Google and several world’s leading research libraries aims to make books available to be searched and read online free of charge. Although the books included so far are not covered by copyright, the plan has attracted the rage of publishers.

Five large book firms are suing Google for violating copyright on material that it has scanned and, although out of print, is still protected by law. Google has said that it will only publish short extracts from material under copyright unless given express permission to publish more, but publishers are unconvinced. Ironically, many publishers are collaborating with Google Print Publisher, which aims to give readers an online taste of books that are commercially available. The searchable collection of extracts and book information is intended to tempt readers to buy the complete books online or in print form.

Amazon, the world’s largest online retailer, has made plans to enter the mass e-book market by selling a vast array of goods. Given that Google should impinge upon its central territory, Amazon revealed that it would introduce two new services. Amazon Pages will allow customers to search for key terms in selected books and then buy and read online whatever part they wish. Amazon Upgrade will give customers online access to books they have already purchased as hard copies. Customers are likely to have to pay five cents a page, with the bulk going to the publisher.

Microsoft has also joined the online-book trend. In October, the software giant said it would spend around $ 200 million to digitize texts, starting with I50,000 that are in the public domain, to avoid legal problems. It will do so in collaboration with the Open Content Alliance. And on Thursday, coincidentally the same day as Google and Amazon announced their initiatives, Microsoft released details of a deal with the British Library, the country’s main reference library, to digitize some 25 million pages ; these will be made available through MSN Book Search, which will be launched next year.

Which of the following is true of Google according to the text()

A. It will invariably provide free online reading for its customers

B. It has become the world’s most popular book publisher

C. It facilitates books reading and searching to a larger extent

D. It has gained permission to publish the complete books online

题型:选择题

当井眼出现倾斜时,()钻具利用钻铤重量的侧向分力,使钻头上产生减斜力,该力永远是减斜的(只要井有斜度)从而达到防斜目的。

A.钟摆钻具

B.偏重钻挺

C.塔式钻具

D.螺旋钻具

更多题库