反应4A(s)+3B(g) = 2C(g)+D(s),经2min,B的浓度减少0

题型:不定项选择题

问题:

反应4A(s)+3B(g)  = 2C(g)+D(s),经2min,B的浓度减少0.6 mol/L。对此化学反应速率的正确表示是  [ ]

A.用A表示的反应速率是0.4 mol/(L·min)

B.分别用B、C表示反应的速率,其比值是3:2

C.在2 min末的反应速率,用B表示是0.3 mal/(L·min)

D.在这2 min内B和C两物质浓度都逐渐减小

考点:化学反应速率的计算
题型:不定项选择题

阅读下面的文字,完成(1)~(4)题。(选做题)

通俗史学家蔡东藩

来新夏

  蔡东藩(1877—1945)的一生正处在中国近代历史发生巨变的时代.他经历了甲午战争的中国失败到中国人民的八年抗日等等惊天动地的事件。世事纷扰.山河破碎,不能不使这个长期接受传统文化教育的知识分子,日益加深其忧惠意识,而不自觉地熔铸了他具有儒家学者三项标准的优秀品格。

  他出身贫寒,过着箪食瓢饮的日子,住着以教读抵租金的居室,如果他能降志辱身混迹官场,也许能博取富贵,但一则他家境贫寒,无力应酬;再则他看到官场各种蝇营狗苟的无耻恶习,实为腐败官场所罕见。从此,他决意敝屣荣华,告病归里,重回“君子固穷”的旧日生活。他手无缚鸡之力,不过一介书生,但能临危不惧,铁骨铮铮,当他所写《民国演义》问世后,因秉笔直书,有触犯军阀劣迹数处,遂遭武夫恐吓,弹头威胁.有人亦劝其曲笔.“隐恶扬善”,但他决不为动,宁愿搁笔,决不曲笔。蔡东藩的种种立身行事,称得起是一位善于继承优秀文化传统的真正儒者。

  蔡东藩自绝望于官场,即倾其毕生精力于著述。蔡东藩著述很多,但能享盛名而传之久远的,则是《历朝通俗演义》。蔡东藩之所以能以极大的毅力完成这套通俗历史著述.绝非一时冲动的偶然行为,而是有其一定的思想基础。他身经国运艰危.目击风雨飘摇,不可避免地会像同时代有些知识分子那样,受到“救亡图存”时代潮流的冲击。当时,“实业救国”、“教育救国”、“富国强兵”等等课题,流传于社会。蔡东藩也必然会结合自己的条件作自己的选择。他深明亡史亡国的教训,而要用自己的文史知识和秃笔凹砚写出两千多年中国历史的兴衰治乱,用以警觉民众,振奋精神,以实现其“演义救国”的素志。就在他思考酝酿过程中,辛亥革命爆发,给他带来了希望的曙光,但迎来的却是北洋军阀集团的统治和袁世凯的帝制自为,蔡东藩在这种政治恶行的刺激下,决定先从《清史通俗演义》开始,其主要目的是以这个被推翻的专制 * * 为靶的,笔伐“洪宪帝制”。他在《清史演义》自序中说:“至关于帝王专制之魔力,尤再三致意,悬为炯戒。”《清史演义》着手于民国四年秋,正是袁世凯等办帝制甚嚣尘上的时候,而成书的次年秋,又是袁世凯自毙之时。这不是巧合,而是作者有意识的行为。从中也能约略窥知撰者为什么把《清史演义》的写作提到第一位的奥和所在。而自序中的词语也正是作者对“洪宪帝制”的历史鞭挞。民国十年正是“直皖战争”给民众带来兵燹灾祸之际,蔡东藩更运其如椽之笔,进一步地投枪于军阀统治的黑暗现状。他历数民元以来的动乱不宁,更明确表达其正直的史德说:“窃不自揣,谨据民国纪元以来之事实,依次演述,分回编纂,借说部之体裁,写当代之状况。语皆有本,不敢虚诬。”史家应有风骨,于此可见,亦无怪乎军阀武夫为之惧,而出以威胁之劣行!

  蔡东藩在历丈编纂法方面,也做出了重要贡献。他的著述虽以“演义”为名,但并不是相沿所谓的“演义体”如《东西汉演义》《三国演义》等等。他不满意《三国演义》之类的演义书,他在《后汉演义》自序中,曾有所评论说:“若罗氏所著之《三国志演义》则脍炙人口,加以二三通人之评定,而价值益增。然与陈寿《三国志》相勘证,则粉饰者十居五六。寿虽晋臣,于蜀魏事不无曲笔,但谓其穿凿失真,则必无此弊。罗氏第巧为烘染,悦人耳目,而不知以伪乱真,愈传愈讹,其误人亦不少也。”蔡氏就以此观点指导整套通俗演义的写作而自成一“新演义”体.“新演义”体的特色是,博览群籍,广搜史料,文笔力求通俗,叙事端在真实,间入稗史遗闻,不过修饰文字,敷衍情节,要不得脱离历史正轨。他还采用夹批、后批和注释等手段.以发挥自己的史观、史识。这一“新演义”体裁,很适于普及历史知识,供社会教化之助。顾便于以国史回归国人,鼓呼民气,尽史家之职责,所以,对“新演义”体固不得以小道视之.而当誉之为通俗史学,并堂皇列位于史部之一目。后之以历史为题材而着笔为历史小说者.何不取法乎此?等而下之,其戏说历史,亵渎历史者流,亦当自愧于先贤!

  蔡东藩以十年寒窗之功,囊括两千余年史事,成《历朝通俗演义》11部600余万字.其有功史学自不待言!

(1)下列对传记有关内容的分析和概括,最恰当的两项是(     )

A.蔡东藩一生正处在中国近代历史发生巨变的时代,他经历丰富。对一些惊天动地的事件目见耳闻.这使《历朝通俗演义》更具真实性。

B.由于蔡东藩在写《民国演义》时坚持其正直的史德秉笔直书,“写当代之状况”。“语皆有本”,使“军阀武夫为之惧”,而遭到军阀的恐吓。

C.蔡东藩的‘新演义”体与传统的《东西汉演义》《三国演义》等“演义体”历史小说不同,他完全采自正史,力求通俗,不修饰文字。

D.蔡东藩认为罗贯中的《三国志演义》“巧为烘染,悦人耳目,而不知以伪乱真,愈传愈讹,其误人亦不少’也”,不适合“供社会教化之助”。

E.作者认为《历朝通俗演义》应列入史学著作之中,作为历史小说的范例,应该效法,而那些戏说历史、亵渎历史的人相比之下应当惭愧。

(2)作者认为蔡东藩“具有儒家学者三项标准的优秀品格”,请结合文章作简要概括。

________________________________________________

(3)蔡东藩将《清史演义》提到第一,并在写书的时间上有意安排,其用意是什么?请简要分析。

________________________________________________

(4)蔡东藩以十年寒窗之功,囊括两千余年史事,成《历朝通俗演义》11部600余万字。你认为影响他写作的最重要的因素是什么?请谈谈你的观点和理由。

________________________________________________

题型:不定项选择题

关于率的标准误,下列论述正确的是()。

A.率的标准误的大小反映样本率与总体率之间差别的大小

B.率的标准误越小,则率的抽样误差越大

C.率的标准误等于P/n

D.率的标准误是总体率与样本率之差

E.率的标准误的计算公式是:

题型:不定项选择题

月经过多的主要病机是______,或______使冲任不固,血随经泄所致。

题型:不定项选择题

Clothes play a critical part in the conclusions we reach about who people are, who they are not, and who they would like to be. They tell us a good deal about the wearer′s background, personality, status, mood, and social outlook.

  Since clothes are such an important source of social information, we can use them to influence people′s impression of us. Our appearance takes on particular significance in the initial phases of interaction. An elderly middle-class man or woman may be alienated (疏远) by a young adult who is dressed in an unconventional manner, regardless of the person′s education, background, or interests.

  People tend to agree on what certain types of clothes mean. Adolescent girls can easily agree on the lifestyles of girls who wear certain outfits (套装), including the number of boyfriends they likely have had and whether they smoke or drink. Newscasters and announcers on TV are considered to be more convincing, honest, and competent when they are dressed conservatively. College students who view themselves as taking an active role in their interpersonal relationships say the costumes they wear change the way they feel about themselves and how they act. Perhaps you have used clothing to gain confidence when you face a stressful situation, such as a job interview, or a court appearance.

  In the workplace, men have long had well-defined role models for achieving success. It has been otherwise for women. A good many women in the business world are uncertain about the appropriate mixture of “masculine”(男性)and “feminine”(女性)characteristics they should convey to men.

  Male administrators tend to judge women more favorably for managerial positions when the women display less “feminine” grooming (打扮)— shorter hair, moderate use of make-up, and plain tailored clothing. As one male administrator confessed, “An attractive woman is definitely going to get a longer interview, but she won′t get a job.”

57. According to paragraph two, an elderly middle-class man and     unconventionally-dressed young man are unlikely to____.

A. understand each other's lifestyle

B. share the same background or interests

C. influence their impressions of each other

D. interact in a positive way

58. The author uses the newscasters' example to show the idea that____.

A. certain clothing gives people more confidence

B. clothes have nothing to do with one's abilities

C. we tend to label people by their clothes

D. competent people always dress conventionally

59. Men's professional clothing can best be described as "_____".

A. conventional                B. individualistic

C. out-of-date                 D. changeless

60. How should professional women dress according to the passage?

A. They must be dressed conservatively.

B. They don't have a certain dressing style to follow.

C. They choose either masculine or feminine clothing.

D. They can't wear unconventional outfits.

题型:不定项选择题

关于精子顶体哪一项是错误的()。

A.为帽状的扁平囊

B.覆盖核的前2/3

C.由高尔基复合体形成

D.内含多种水解酶

E.顶体酶的功能是杀菌

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