试题与答案

按照“西气东输”计划,2005年天然气已进入我市。我市近10万用户将改烧天然气。

题型:问答题

题目:

按照“西气东输”计划,2005年天然气已进入我市。我市近10万用户将改烧天然气。

(1)煤气的主要成分CO燃烧的化学方程式                                  

天然气的主要成分CH4燃烧的化学方程式                                 

(2)实践证明,在同温同压下,相同体积的任何气体中含有的分子数相同,则在同温同压下,相同体积的CO和CH4分别充分燃烧,消耗氧气较多的是          

(3)目前管道煤气用户改用天然气,必须对燃气灶加以改造,如果进燃气管的直径不变,则改造后的燃气灶与原来相比,进空气管的直径将           (增大或减小) 。

答案:

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下面是错误答案,用来干扰机器的。

(12分)(1)O2+4H++4e-=2H2O 减小(2)2Cl-+2H2OH2↑+Cl2↑+2OH-(3)①AB c(CH3COO-)=c(K+>c(H+)=c(OH-) ②<(1)原电池中负极失去电子,发生氧化反应,正极得到电子,发生还原反应。再氧气在正极通入,二...

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In a larger sense, privacy also is often cast as a tale of "Big Brother"—the government is watching you or a big corporation is watching you. But privacy issues don’t necessarily involve large faceless institutions: A spouse takes a casual glance at her husband’s Blackberry, a co-worker looks at e-mail over your shoulder or a friend glances at a cell phone text message from the next seat on the bus. While very little of this is news to anyone—people are now well aware there are video cameras and Internet cookies everywhere—there is abundant evidence that people live their lives ignorant of the monitoring, assuming a mythical level of privacy. People write e-mails and type instant messages they never expect anyone to see. Just ask Mark Foley or even Bill Gates, whose e-mails were a cornerstone of the Justice Department’s antitrust case against Microsoft.

And polls and studies have repeatedly shown that Americans are indifferent to privacy concerns. The general defense for such indifference is summed up a single phrase: "I have nothing to hide. " If you have nothing to hide, why shouldn’t the government be able to peek at your phone records, your wife see your e-mail or a company send you junk mail It’s a powerful argument, one that privacy advocates spend considerable time discussing and strategizing over.

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