某实验室的尾气中含有较多的氯气,有毒,要吸收这些尾气,下列试剂最适合的是( )

题型:选择题

问题:

某实验室的尾气中含有较多的氯气,有毒,要吸收这些尾气,下列试剂最适合的是(  )

A.饱和的石灰水

B.饱和的食盐水

C.自来水

D.氢氧化钠溶液

考点:氯气
题型:选择题

阅读下面论说类文章,完成小题。(9分)

我们印象最深刻的是,恒星即使在两个旋臂之间,也像流水一样漂浮在我们的四周——气势磅礴的自身发光的星球,有些虽然象肥皂泡一样脆弱,却又大得可以容得下1万个太阳或1万亿个地球;有些小如一座城池,但密度却比铅大100万亿倍。有些恒星跟太阳一样是孤独的;多数恒星有伴侣,通常是成双成对,互相环绕。但是那些星团不断地从三星系逐渐转化成由数十个恒星组成的松散的星团,再转化成由百万个恒星组成的璀璨夺目的大球状星团。有些双星紧靠在一起,星体物质在他们之间川流不息,多数双星都象木星与太阳一样分离开来。有些恒星——超新星——的亮度跟它们所在的整个星系的亮度一样;有些恒星——黑洞——在几公里以外就看不见了。有些恒星的光彩长年不减;有些恒星闪烁不定,或以匀称的节奏闪烁着。有些恒星稳重端庄地转动着,有些恒星狂热地旋转着,弄得自己面貌全非,成了扁圆形。多数恒星主要是以可见光成红外光放出光芒;其他恒星也是X光或射电波的光源。发蓝光的恒星是年青的星,会发热;发黄光的恒星是常见的星,它们已经到了中年;发红光的恒星常常是垂亡的老年星;而发白光或黑光的恒星则已奄奄一息。银河里大约有4千亿个各种各样的恒星,它们的运转既复杂又巧妙。对于所有这些恒星,地球上的居民到目前为止比较了解的却只有一个。

每个星系都是太空中的一个岛屿,它们与其邻居隔光年之距遥遥相望,我可以想象,在无数星球上的生物对宇宙的模糊认识是如何产生的:他们在开始的时候都以为,除了他们自己小小的行星以及他们周围的那些区区可数的恒星以外,再也没有其他的星星了。我们是在与世隔绝的情况下成长起来的,我们对宇宙的正确认识是逐渐形成的。

小题1:下面对“恒星”的理解,符合文意的一项是(   )

A.恒星是一个能自身发光的星球,它像流水一样漂浮在我们的四周。

B.和地球相比,恒星体积非常庞大,但像肥皂泡一样脆弱。

C.恒星有伴侣,通常是成双成对,互相环绕,有些双星甚至紧靠在一起。

D.恒星自成体系,在太空之中,跟太阳一样是孤独的。小题2:对文段中恒星发光情况的分析理解不正确的一项是(   )

A.多数恒星主要是以可见光成红外光放出光芒。

B.有些恒星发蓝光,据此我们可以断定它是年青的星。

C.恒星到了中年以后,它们就会发黄光而成为常见的星。

D.如果恒星发白光或黑光,它就到了奄奄一息的时候了。小题3: 根据文章内容,下面的推断不正确的一项是(   )

A.有些恒星成了扁圆形是因为它们在狂热地旋转着,弄得自己面貌全非。

B.恒星是由炽热气体组成的,本身能发光的天体,所以太阳是恒星。

C.我们生活在地球上,对恒星的了解远远不够,到目前为止比较了解的还只有一部分。

D.因为各个星系之间相隔遥远,所以我们对相邻星系的正确认识是逐渐形成的。

题型:选择题

肺灌注显像中为较好地观察左下肺动脉的血流情况,应采取的检查体位是()。

A.ANT(前后位)

B.POST(后位)

C.左侧位

D.左前斜位

E.30°左后斜位

题型:选择题

阅读理解。

     The growing popularity of digital reading has encouraged best-selling young Chinese author Han Han to

release (发表) his new novel on the Internet.

     Ta De Guo (His Country), of which Han Han has finished only one tenth so far, will be available for paid

reading from December 1st on Qidian.com, the online library has announced.

     Han Han will update the story every day and finish the book before the end of the year. A printed edition

will only be produced after all of the content goes online, sources said.

     To read the entire book, readers will have to pay eight yuan, or 0.08 yuan per 1,000 words. This is almost

four times the price of an average writer on Qidian.com.

     Lu Jinbo, a well-known publisher, estimated that a popular writer like Han Han is likely to attract 20 million

subscribers. That means this high-school-dropout-turned popular author could bring in 160 million yuan, nearly

40 times as much as he earned in copyright royalties (版税) last year.

     On the 2007 list of Chinese millionaire writers, Han Han ranked 13th with 3.8 million yuan. The richest, Guo

Jingming, earned 11 million yuan.

     Statistics from China Internet Network Information Center show that there are at least 253 million Internet

users in China. Such a large-scale Internet population has developed a prosperous industry for online novel

writing. Among the many success stories is Zhang Muye, an office worker whose fantasy novel Ghost Blows

out the Light made him the 19th wealthiest author in 2007.

     Besides the potential to gain a large readership base, the Internet writers are being recognized professionally.

The jury (评委) of the Mao Dun Literature Prize, the most prestigious (有影响力的) honor for Chinese writers,

is considering adding a category for online writers.

1. According to the passage, online writing is becoming more and more popular mainly because _____.

A. it's a good way to save paper

B. it's convenient to write online

C. all the online stories are interesting

D. Internet users in China are increasing

2. From the passage, we can learn that Ta De Guo is a novel of _____ words.

A. 300,000

B. 200,000

C. 150,000

D. 100,000

3. Which of the following statements is true?

A. Han Han has already finished writing Ta De Guo.

B. All the online authors are millionaires.

C. Guo Jingming earned less than any other online author in 2007.

D. Online writers are being accepted by readers and some organizations.

4. What's the author's attitude towards digital reading?

A. Doubtful.

B. Objective.

C. Negative.

D. Subjective.

题型:选择题

科举考试开始于 ( )

A.唐代

B.汉代

C.秦代

D.隋代

题型:选择题

某医院进口一批医用超声诊断设备,必须获得国家出入境检验检疫部门签发的进口安全质量许可证和批准使用的“安全标志”后,方准入境。( )

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