下列溶液中有关微粒的物质的量浓度关系正确的是:
A.物质的量浓度相等的① NH4HSO4溶液、② NH4HCO3溶液、③ NH4Cl溶液中,pH的大小关系:②>①>③
B.90℃时,将CH3COONa溶液和稀盐酸混合至溶液pH=7:
c(Na+)>c(CH3COO-)>c(Cl-)=c(CH3COOH)>c(H+)=c(OH-)
C.将lmolNaClO和2molNaHC03配制成1L混合溶液:c(HClO)+c(ClO-)=2c(HCO3-)+2c(H2CO3)+2c(CO32-)
D.浓度均为0.1mol/L的NH3·H2O和NH4Cl溶液等体积混合后,若溶液呈碱性,则溶液中:
C(NH4+)>c(Cl-)>c(NH3·H2O)>c(OH-)>c(H+)
已知函数
(1)当时,求不等式
的解集;
(2)若的解集包含
,求
的取值范围.
《国务院关于印发“宽带中国” 战略及实施方案的通知》指出,发展宽带网络对拉动有效投资和促进信息消费、推进发展方式转变和小康社会建设具有重要支撑作用。这表明
①人们可以通过改变规律存在的条件为人类造福 ②自在事物的种种联系具有主观性
③人为事物的联系是客观的 ④人们可以根据事物固有的联系建立新的联系
A.①② B.③④ C.①③ D.②④
阅读下面的短文,并根据短文后的要求答题(请注意问题后的字数要求)。
If you are thinking of using advertising to promote your business,consider the following tips.
1.Develop a detailed marketing plan
Ask professionals to develop marketing plans that provide you with a comprehensive understanding of your businesses and industries.A marketing plan will provide you with internal /external situational analysis,Pricing,Distribution,Strategies and Tactics(战术),Marketing Research, Implementation Schedules,Evaluation Strategies,and more.
A professional marketing plan pays off in great profits by getting rid of wasted advertising and marketing efforts and unnecessary costs.
2.Plan your advertising schedule several months in advance.
Failure to plan advertising in advance wastes a lot of money. Rushed charges, poor creativity and poor copy are the usual results of .Take a blank calendar and fill in the days, months or quarters to advertise to your target markets. Figure out the number of ad insertions that will make sense and negotiate an agreement with the various media suppliers in those areas.
3.Hire professionals to handle your advertising.
When you need to advertise, hire an ad agency. You need to concentrate your time and efforts in areas of your business in which you do best.
Agencies are experts. They charge for their time and experience and have one goal in mind: to get the best results for their clients in order to keep those customers. An agency will research your market and your audience to learn the real situations concerning your product or services.
4.Provide as much information as possible to your agency.
In order to write the most persuasive copy and to design the most effective ads, it is important for your agency to know what has worked in the past. There is nothing wrong with using information from previously successful ads.
5.Focus your message on what is important for your audience.
Your target audience will be more concerned about what you can do for them. Speak to the audience in their language, in a way they can understand.Big or unusual words should be avoided. Your job is to sell your audience on using your products or services.
1.What is the best title of the passage? (Please answer within 10 words.)
_________________________________________________________________
2.Which sentence in the passage can be replaced by the following one?
It's ok for your advertiser to learn from the good ads you've had.
_________________________________________________________________
3.Please fill in the blank in the fourth paragraph with proper words or phrases to complete the sentence. (Please answer within 10 words.)
_________________________________________________________________
4.Which of the tips do you think is most important? Why? (Please answer within 30 words.)
_________________________________________________________________
5.Translate the underlined sentence in the third paragraph into Chinese.
_________________________________________________________________
湖南宜章县县委书记带头给公车喷涂上“公务用车”标识,随车还印有投诉监督电话,让公车运行置于百姓监督之下。给公车上装表明( )
①我国是公民当家作主的国家 ②我国的人民民主具有真实性
③我国政府的原则是为人民服务 ④中国共产党坚持执政为民
A.①③ B.②③ C.②④ D.③④
洋务运动期间,中国最可能仿造的是 ( )
A B C D
(2010年11月江苏九校联考高三调研16题)1922年,爱因斯坦获得诺贝尔物理学奖。这主要是为了表彰他
A.深刻提示了时间和空间的本质属性
B.修正了经典力学的绝对时空论
C.证明了空间、时间和质量都与物体的运动速度无关
D.在光电效应方面的突出成就
为选拔选手参加“中国谜语大会”,某中学举行了一次“谜语大赛”活动.为了了解本次竞赛学生的成绩情况,从中抽取了部分学生的分数(得分取正整数,满分为100分)作为样本(样本容量为)进行统计.按照
,
,
,
,
的分组作出频率分布直方图,并作出样本分数的茎叶图(图中仅列出了得分在
,
的数据).
(Ⅰ)求样本容量和频率分布直方图中的
、
的值;
(Ⅱ)在选取的样本中,从竞赛成绩在80分以上(含80分)的学生中随机抽取3
名学生参加“中国谜语大会”,设随机变量表示所抽取的3名学生中得分在
内的学生人数,求随机变量
的分布列及数学期望.
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“”是“方程
表示的图形为双曲线”的
A.充分不必要条件 B.必要不充分条件
C.充要条件 D.既不充分也不必要条件
将函数图象向左平移
个单位,所得函数图象的一条对称轴的方程是
A. B.
C.
D.
下列关于基因和染色体关系的叙述,正确的是( )
A.细胞分裂各时期的每条染色体上都含有一个DNA分子
B.染色体就是由基因组成的
C.一条染色体上有一个或多个基因
D.基因在染色体上呈线性排列
全面推进依法治国的总目标是( )
A.坚持中国共产党的领导
B.实现中华民族的伟大复兴
C.建设中国特色社会主义法治体系,建设社会主义法治国家
D.实现共同富裕
《礼记》记述了贵族朝会的列位礼节:天子南向而立;三公,中阶之前;诸侯,阼阶(东台阶)之东;诸伯,西阶之西;诸子,门东……九夷,东门外;八蛮,南门外。与此相关的政治制度是
A.分封制 B.三公九卿制 C.郡县制 D.郡国并行制
常温下,下列各组离子在指定溶液中可能大量共存的是( )
A.由水电离的c(OH-)=10-12mol·L-1的溶液中:Br-、CO32-、K+、SO32-
B.含有大量AlO2-的溶液中:K+、Al3+、Br-、SO42-
C.和Al反应放出氢气的溶液:Na+、Cl-、NH4+、NO3-
D.使pH试纸变深蓝色的溶液中:Cl-、K+、Mg2+、SO42-
针对人民币汇率的变动对世界金融市场有何影响,人民币如何应对本次金融危机、维持我国的金融稳定成为国际、国内专家的讨论热点。在看待人民币汇率问题上,三个经济学家作了如下辩论:
第一个经济学家笑说:“如果现在人民币升值,咱口袋里的人民币就值钱了,出国也神气多了。”
第二个经济学家反对:“如果现在升值,恐怕你还没出国,就失业了。”
第三个经济学家总结:“如果人民币汇率稳定,随着经济发展,咱口袋里的人民币还会多起来,出国时还能神气起来。”
运用学过的知识,谈谈你对上述三种不同观点的看法。