口算.12j÷6j=八jj÷九j=24j+6j=7九×4j=42j÷7j=424

题型:解答题

问题:

口算.
12j÷6j=
八jj÷九j=24j+6j=7九×4j=42j÷7j=
424÷6j≈164÷8j≈268÷9j≈24j÷21≈298÷九1≈
考点:认识乘法
题型:解答题

做“凸透镜成像”实验时:  

(1) 将蜡烛、凸透镜和光屏放在光具座上,使烛焰、凸透镜和光屏 三者的中心大致在 ___________________,并使光屏与透镜所在的平面____________________  

(2) 将蜡烛放在二倍焦距以外的某点a 时,移动光屏找到像,则光   屏上的像是倒立、 ___________的.

(3)将蜡烛从a点沿光具座移动至一倍焦距与二倍焦距之间的某点b的过程中,所成的像 __________(至少有一个选项正确,将正确选项的字母填在横线上).

A.先是缩小的后是放大的

B.始终是缩小的

C.逐渐变大.

D.先逐渐变小后逐渐变大

(4)将蜡烛放在一倍焦距以内,移动光屏找像时,看到光屏上出现一个大致是环状的暗区,如图所示.这个暗区是怎样产生的?(注:该实验所用的凸透镜没有边框)

题型:解答题

按购买者类型不同来划分汽车市场的一项是()。

A.轿车市场、商用车市场

B.私人用车市场、商务及事业性单位用车市场、机关公务用车市场、生产经营性用车市场

C.中档车市场、豪华车市场、低档车市场、微型车市场

D.营运车市场、商务车市场、公务车市场、轿车市场

题型:解答题

井下高压电动机、动力变压器的高压控制设备应具有()()()和欠压释放保护功能。

题型:解答题

临床实践中知情同意的主要告知形式应为()。

A.短信告知

B.口头告知

C.电话告知

D.书面告知

E.其他方式告知

题型:解答题

Many video games feature an invincibility power-up that makes the players impervious to damage, at least for a while. As the economic crisis hit in late 2008, some said the same about the industry itself. The theory went that sales of video games, which had been p in 2008, would also be p in 2009, because games are a relatively cheap form of entertainment that let people escape from gloomy economic reality.

At first glance the sales figures seem to debunk the idea that video games are recession-proof. In June 2009, for example, sales of games in America were 31% lower than in June 2008, according to NPD, a market-research firm. In July sales were down 26% , the fifth successive monthly decline. But the year ended with a record-breaking December, as people bought consoles and games for Christmas. Globally, says Piers Harding-Rolls of Screen Digest, a consuhancy, sales of games were down by 6.3% in 2009. The number of Nintendo Win and Microsoft Xbox 360 consoles sold was flat in 2009 ; sales of Sow’s PlayStation 3 were up by 22% after a price cut.

In some respects, this stumble reflects gaming’s new popularity. When it was less of a mainstream activity it was not so connected to the wider economic cycle. The success of the family-friendly Wii has broadened gaming’s appeal, but the new players it has attracted are less fanatical garners who are more likely to cut back in hard times. During 2009 more people turned to mobile, web-based or second-hand games, says Mr Harding-Rofls.

Another way of looking at things, however, is to say that spending on gaming is driven by big hits, and that the slight decline in 2009 reflects creative rather than economic weakness. Entertainment industries always have their ups and downs, says Shigeru Miyamoto, the creative force behind many of Nintendo’s biggest games. There was an unusually large number of hits in 2008, which boosted sales, and fewer big releases in 2009 until late in the year, which may explain the weak mid-year sales. The biggest hit was "Modern Warfare 2", released in November, which became the fastest-selling game in history, selling 7 million copies worldwide on its first day. The top 20 games took a larger share of sales in 2009 than in 2008, which shows that the games industry is becoming increasingly polarised between hits and misses. Hence the hit-and-miss results of the big publishers of video games.

Overall, says Mr Miyamoto, 2009’s crop of games may just have been less compelling. "We were not able to produce fun-enough products," he says. That highlights the importance of continued innovation, he says—but it leaves unanswered the question of whether gaming is indeed recession-proof.

In America, which month is the most highest sales of video games()

A. June in 2008

B. March In 2009

C. November in 2009

D. December in 2009

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