标准状况下VL氨气溶解在1L水中(水的密度近似为1g/mL),所得溶液的密度为ρ

题型:选择题

问题:

标准状况下VL氨气溶解在1L水中(水的密度近似为1g/mL),所得溶液的密度为ρg/mL,质量分数为ω,物质的量浓度为c moL/L,则下列关系中不正确的是(溶质用NH3表示)(  )

A.ρ=

17V+22400
22.4+22.4V

B.ω=

17V
17V+22400

C.c=

1000Vρ
17V+22400

D.ω=

17c
1000ρ

考点:物质的量浓度溶液质量分数的计算
题型:选择题

阅读下面的短篇小说《用善良做底色》,完成后面题目。(14分)

用善良做底色

松 韵

天气冷得出奇,寒风咆哮着卷起雪花,升腾起呛人的白烟。

温暖的红砖房里,母亲在厨房里忙碌着,柴火在灶坑里噼啪作响,锅上冒着润白的蒸气。我和弟弟早就饿了,正眼巴巴地等待着第一锅酸菜肉蒸饺出笼。

这时,有人叫门。父亲出去片刻,带回一个衣着单薄的外乡人来。看上去是个20多岁的农民,但是很年轻,嘴唇都发青了,显然在风雪中冻了很久。

“这丝棉很好的,你看看。”他说着,卸下肩上的旧麻袋,就要往外掏丝棉。

“别拿了,我不买丝棉。”父亲止住了他,“外面太冷,请你进屋暖和暖和!”“哦,不买?不买啊?这丝棉好,真的很好。”他有些失望,坐在暖和的火墙旁,一时却也并不想挪动。

这时,母亲端上了两大盘热腾腾的酸菜肉蒸饺。“你一定饿了,吃几个饺子挡挡寒吧!”母亲看着仍有些哆嗦的他,把筷子递过去。

那人的确是饿了,推辞了一下,便接过筷子狼吞虎咽起来。当他意识到我们一家人还没吃饭时,两盘蒸饺只剩下了小半盘。他尴尬地抬起来,窘迫不安地嗫嚅道:“这……我……我……你们,你们还没吃吧?”

母亲笑道:“还有呢,你要吃饱了啊!”

蒸饺的确还有,可那一笼是纯素馅儿的,一丁点儿肉都没放。

弟弟捏了捏我的衣角,嘟起嘴来。

一盘半的蒸饺,对他来说可能也就六分饱,但无论如何他也不肯再吃了。

接下来的聊天中,我们知道他是安徽的农民,跟父亲弟弟一起到北方贩丝棉,没想到折了本,近年关了,打算把剩下的丝棉低价处理了,好歹挣回返乡的路费。  “我兄弟的脚冻坏了,他跟我父亲在车站蹲着呢。今儿天太冷,没让他们出来,我寻思把最后一包丝棉卖了,今晚就跟他们坐火车回去。”他说。

母亲听了,感叹道:“唉,你们做点小生意,也挺不容易啊!”

父亲跟母亲轻声说了点什么,母亲便去仓房找了三双半新的棉鞋,还有半面袋的冻豆包回来,递给这个年轻人说:“我们也不是有钱人家,要不然,就把你这丝棉买下了。这双棉鞋你换上,另两双拿去给你父亲和弟弟穿,北方不比南方,脚冻伤了可了不得!冻豆包我们今年蒸得多,你带几个让你的父亲和弟弟尝尝吧!”

年轻人站了起来,拘谨地搓着手,一遍遍地说:“这可咋好呢?这可咋好呢?我这是遇上好人家了!”

我们把他送出门时,年轻人一眼瞥见院子里一堆锯好的圆木。他突然放下肩上的包,三步两步抢过去,“我干点儿活再走!”说着便抡起大斧,劈起柴来。母亲正要劝阻,父亲说: “让他干吧!”

寒风中,雪花飘飞,年轻人已经走了,我家院子里,整整齐齐地码着一垛劈得粗细均匀的柴火。

弟弟吃了剩下的半盘有肉的蒸饺,玩去了。我跟父母吃着第二笼纯素馅儿的蒸饺,觉得温暖而香甜。

我一直认为,在这个世界上,最赏心悦目的,是纤尘未染的青山绿水;最温暖人心的,是人与人之间纯洁真挚的感情。 暮年回首时,最有价值的财富,应是一颗恬淡宁静的心,和一份丰富无悔的回忆。而所有这一切的拥有,都需要用一颗善良单纯的心做底色。

小题1:文章开头第一段的环境描写有何作用?(3分)

小题2:“我”和父母吃着纯素馅蒸饺时,为什么会觉得“温暖而香甜”?(2分)

小题3:年轻人在作出为“我”家劈柴的决定时,心理活动是怎样的?请联系上下文,用文字写出来。(3分)

年轻人在为“我”家劈柴时,母亲要阻止,而父亲却说“让他干吧”, 父亲这样做的原因是什么呢?(3分)

读下面的材料,然后结合本文,说说你的感受。(3分)

2007年2月16日,刚刚卸任的联合国秘书长安南,在得克萨斯州的一个庄园里举行了一场慈善晚宴,旨在为非洲贫困儿童募捐,应邀参加晚宴的都是富商和社会名流。当天慈善晚宴的主角不是倡议者的安南,不是捐出300万美元的巴菲特,而是仅仅捐出30美元零25美分的小露西。她说了这样一句话:“慈善的不是钱,是心。”让全场的人感动不已。

题型:选择题

呕吐,吐势徐缓,声音微弱,呕吐物清稀,其临床意义是()。

A.寒饮停胃,胃失和降

B.痰湿中阻,胃失和降

C.胃阴不足,胃气上逆

D.脾胃阳虚,胃失和降

E.饮斜停胃,胃气上逆

题型:选择题

阅读理解

     It has been more than twenty years since pioneering British computer programmer, Sir Tim Berners

Lee, created the World Wide Web. But could he have ever imagined how much the web would change

our lives? And would he approve of how some British students are taking advantage of his invention?

     Universities and exam boards around the UK are becoming increasingly concerned with the rising

number of cases of plagiarism, many of which are facilitated (助长) by the Internet access.

     In the UK most school and university students complete coursework throughout the academic year

which contributes toward their final mark. In many cases coursework makes up the main part of the

qualification. Since coursework is completed in the students' own time it cannot be monitored by teachers

in the same way as an exam.

     Derec Stockley, director of examinations in the UK, explains, "Plagiarism affects coursework more

than anything else, and in the cases that come to our attention, more and more are linked to the Internet."

     At a university level recent reports suggest that plagiarism has evolved from separate cases of

individual cheating to systematic and even commercial operation. Students can now pay for bespoke

essays to be written for them by experts.

      It is estimated that the market in online plagiarism is now worth 200 million pounds a year. Every

month more and more websites offering to write student's essays for them appear on the Internet.

Barclay Littlewood, owner of Degree Essays UK employs 3,500 specialist writers and charges between

120 pounds and 4,000 pounds per essay. However, Mr. Littlewood refutes the accusation that he is

helping students to cheat.

1. What dose the underlined word "plagiarism" in Paragraph 2 mean in the passage?

A. Coursework.     

B. Problems of the Internet.

C. Learning pressure.  

D. Cheating.

2. Which of the following statements is mentioned by the author?

A. With the help of online plagiarism, students can write more creative coursework.

B. There will be no problem if online plagiarism is a systematic and commercial operation.

C. The Internet seems to have contributed much to the problem of online plagiarism.

D. Teachers should lay more emphasis on exams than coursework.

3. It can be inferred from the text that the author seems to ________.

A. blame Sir Tim Berners Lee for having created the World Wide Web

B. worry about the quality of students' coursework influenced by the World Wide Web

C. be in favour of Littlewood's defense against the accusation of him

D. have studied the problem of online plagiarism for nearly 20 years

4. Who should be blamed for online plagiarism?

A. Barclay Littlewood.

B. Sir Tim Berners Lee.

C. Derec Stockley.

D. Nobody.

5. The paragraph following the passage will most probably be about ________.

A. the author's opinions of Mr. Littlewood

B. different people's opinions on plagiarism

C. how students use the website of Mr. Littlewood

D. Mr. Littlewood's defence against those who accused him of his website

题型:选择题

对同步发电机转子铁心的要求是,不但要有良好的(),而且要有足够的()。

题型:选择题

下列影响合理用药的医师因素中,长期使用熟悉的几种药物属于

A.缺乏药物和治疗学知识

B.医德医风不正

C.知识信息更新不及时

D.责任心不强

E.临床用药监控不力

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