下列事件:①小明以5m/s的速度运动了10s,则走了50m;②某地区今年降雨量在

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问题:

下列事件:①小明以5m/s的速度运动了10s,则走了50m;②某地区今年降雨量在5mm到50mm之间;③检查流水生产线上的一件产品,是合格产品还是不合格产品;④某班某次测试的及格率为80%,则不及格率为20%。其中是不确定事件的有(    )个。

考点:概率的意义
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下图(一)是反射弧的组成示意图(虚线内为神经中枢),图(二)是一个突触的结构示意图,根据图示信息回答下列问题:

(1)图(一)中表示感受器的是编号____,感受器接受刺激后,接受刺激部位的膜内电位变化是_______。

(2)图(一)中共有突触______个;位于神经中枢内的细胞体有_____个;如果箭头表示人体内神经冲动的传导方向,其中表示错误的是_________(填箭头旁字母)

(3)图(一)中如果感受器受到刺激后产生兴奋,图中ABCD处首先测到局部电流的是______处。

(4)图(二)中的结构“1”表示___________,释放的物质“3”表示_________。

(5)缩手反射属于____________,当我们取指血进行化验时,针刺破手指的皮肤,但我们并未将手指缩回。这说明一个反射弧中的低级中枢要接受_____________的控制。

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The iPhone, the iPad: each of Apple’s products sounds cool and has become a fad(一时的风尚). Apple has cleverly taken advantage of the power of the letter “i” —and many other brands are following suit. The BBC’s iPlayer —which allows Web users to watch TV programs on the Internet —adopted the title in 2008. A lovely bear —popular in the US and UK—that plays music and video is called “iTeddy”.

A slimmed-down version of London’s Independent newspaper was launched last week under the name “i”.

In general, single-letter prefixes(前缀) have been popular since the 1990s, when terms such as e-mail and e-commerce first came to use..

Most “i” products are targeted at young people and considering the major readers of Independent’s “i”, it’s no surprise that they’ve selected this fashionable name.

But it’s hard to see what’s so special about the letter “i”. Why not use “a”, “b”, or “c” instead? According to Tony Thorne, head of the Language Center at King’s College. London, “i” works because its meaning has become ambiguous. When Apple uses “i”, no one knows whether it means Internet, information, individual or interactive, Thorne told BBC Magazines.” Even when Apple created the iPod, it seems it didn’t have one clear definition,” he says.

“However, thanks to Apple, the term is now associated with portability(轻便),” adds Thorne.

Clearly the letter “i” also agrees with the idea that the Western World is centered on the individual. Each person believes they have their own needs, and we love personalized products for this reason.

Along with “Google” and “blog”, readers of BBC Magazines voted “i” as one of the top 20 words that have come to define the last decade.

But as history shows, people grow tired of fads. From the 1900s to 1990s, products with “2000” in their names became fashionable as the year was associated with all things advanced and modern. However, as we entered the new century, the trend inevitably disappeared.

(   ) 小题1:. People use iPlayer to        .

A.listen to music

B.make a call

C.watch TV programs online

D.read newspapers(   ) 小题2:. We can infer that the Independent’s “i” is aimed at         .

A.young readers

B.old readers

C.fashionable women

D.engineers(   ) 小题3:. The underlined word “ambiguous” means         .

A.popular

B.uncertain

C.definite

D.unique(   )小题4:. Nowadays, the “i” term often reminds people of the products which are         .

A.portable

B.environmentally friendly

C.advanced

D.recyclable(   ) 小题5:.. The writer suggests that         .

A.“i” products are often of a high quality

B.the popularity of “i” products may not last long

C.the letter “b” replaces letter “i” to name the products

D.iTeddy is a live bear

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对于同一种化学物,在相同条件下,下列哪项毒性指标数最大()。

A.LD0

B.LD01

C.LD50

D.LD99

E.LD100

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呼吸道分泌的主要免疫球蛋白()

A.IgG

B.IgA

C.IgM

D.IgE

E.SIgA

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VaR方法使得不同类型资产的风险之间具有可比性,成为联系整个企业或机构各个层次的风险分析、度量方法。( )

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