下列热化学方程式书写正确的是(△H的绝对值均正确) [ ] A.C2H5OH(l

题型:选择题

问题:

下列热化学方程式书写正确的是(△H的绝对值均正确) [ ]

A.C2H5OH(l)+3O2(g)==2CO2(g)+3H2O(g);△H=-1367.0 kJ/mol(燃烧热)

B.NaOH(aq)+HCl(aq)==NaCl(aq)+H2O(l);△H=+57.3kJ/mol(中和热)

C.S(s)+O2(g)===SO2(g);△H=-269.8kJ/mol(反应热)

D.2NO2==O2+2NO;△H=+116.2kJ/mol(反应热)

考点:焓变、反应热中和热燃烧热
题型:选择题

关于心电图波形的含义,错误的是()

A.P波为心房除极波

B.Ta波为心房复极波

C.QRS波群为心室除极波

D.T波为心室复极波

E.P-R(Q)间期为心房除极终了至心室除极开始的时间

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男性,25岁,因车祸撞伤腹部,病人诉腹痛难忍,伴恶心、呕吐,X线腹透见膈下游离气体,拟诊为胃肠道外伤性穿孔。

可减少腹腔毒素的吸收体位是

A.平卧位

B.侧卧位

C.俯卧位

D.半卧位

E.头低足高位

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下列不是我国刑法规定的刑罚是

A.有期徒刑

B.撤职

C.管制

D.罚金

E.没收财产

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枢纽地区的小运转列车的作业方式及范围由()自定。

A.铁道部

B.铁路局

C.铁路分局

D.车辆段

题型:选择题

Prince Klemens Von Metternich, foreign minister of the Austrian Empire during the Napoleonic era and its aftermath, would have no trouble recognizing Google. To him, the world’s most popular web-search engine would closely resemble the Napoleonic France that in his youth humiliated Austria and Europe’s other powers. Its rivals—Yahoo!, the largest of the traditional web gateways, eBay, the biggest online auction and trading site, and Microsoft, a software empire that owns MSN, a struggling web portal—would look a lot like Russia, Prussia, and Austria. Metternich responded by forging an alliance among those three monarchies to create a "balance of power" against France. Google’s enemies, he might say, ought now to do the same thing.

Google announced two new conquests on August 7th. It struck a deal with Viacom, an "old" media firm, under which it will syndicate video clips from Viacom brands such as MTV and Nickelodeon to other websites, and integrate advertisements into them. This makes Google the clear leader in the fledgling but promising market for web-video advertising. It also announced a deal with News Corporation, another media giant, under which it will pro-vide all the search and text-advertising technology on News Corporation’s websites, including My Space, an enormously popular social-networking site.

These are hard blows for Yahoo! and MSN, which had also been negotiating with News Corporation. Both firms have been losing market share in web search to Google over the past year—Google now has half the market. They have also fallen further behind in their advertising technologies and networks, so that both make less money than Google does from the same number of searches. Safa Rashtchy, an analyst at Piper Jaffray, a securities firm, estimates that for every advertising dollar that Google makes on a search query, Yahoo! makes only 60-70cents. Last month Yahoo! said that a new advertising algorithm that it had designed to close the gap in profitability will be delayed, and its share price fell by 22% , its biggest-ever one-day drop.

MSN is further behind Google than Yahoo! in search, and its parent, Microsoft, faces an even more fundamental threat from the expansionist new power. Many of Google’s new ventures beyond web search enable users to do things free of charge through their web browsers that they now do using Microsoft software on their personal computers. Google offers a rudimentary but free online word processor and spreadsheet, for instance.

The smaller eBay, on the other hand, might in one sense claim Google as an ally. Google’s search results send a lot of traffic to eBay’s auction site, and eBay is one of the biggest advertisers on Google’s network. But the relationship is imbalanced. An influential re-cent study from Berkeley’s Haas School of Business estimated that about 12% of eBay’s revenues come indirectly from Google, whereas Google gets only 3% of its revenues from eBay. Worst of all for eBay, Google is starting to undercut its core business. Sellers are setting up their own websites and buying text advertisements from Google, and buyers are using its search rather than eBay to connect with sellers directly. As a result, "eBay would be wise to strike a deep partnership with Yahoo! or Microsoft in order to regain a balance of power in the industry," said the study’s authors, Julien Decot and Steve Lee, sounding like diplomats at the Congress of Vienna in 1814.

Google wins an advantage over MSN in that()

A. Google offers a more powerful search tool than MSN

B. Microsoft are better at designing such software as Windows

C. MSN has some unquenchable technical loopholes in its software

D. users can perform certain tasks for free with Google’s support

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