一对相互啮合的直齿齿轮模数为2,则齿轮的齿顶间隙为()mm。A.2; B.1.5;

题型:单项选择题

问题:

一对相互啮合的直齿齿轮模数为2,则齿轮的齿顶间隙为()mm。

A.2;

B.1.5;

C.1;

D.0.5。

考点:起重机操作证考试水电起重机械操作工考试水电起重机械操作工考试题库
题型:单项选择题

某工地发生钢筋混凝土预制梁吊装脱落事故,造成6人死亡,直接经济损失900万元,该事故属于( )

A.特别重大事故

B.重大事故

C.较大事故

D.一般事故

题型:单项选择题

将一小块钠投入CuSO4溶液中,观察到的现象是__________(填序号)。

①钠浮于液面上;②熔化成小球;③发出嘶嘶的响声,放出气体;④有蓝色沉淀产生;⑤析出大量红色的铜。用离子方程式解释实验现象_________________________________________________

题型:单项选择题

阅读下面的文字,完成下面问题。

忠魂一缕枕江流

蔡勋建

  在我阅读的记忆里,汨罗江应是在一个叫磊石山的地方汇入洞庭湖的。我没到过那地方,我想象不出具体方位,那是个怎样的地形。但我知道汨罗江是一条很怪的河流,几次向西,然后朝北,踏入洞庭。我曾说过我一定要去汨罗山拜谒屈老先生的。我好想从洞庭湖出发,越过磊石山,沿着汨罗江溯流而上,那里是他的魂灵安息的地方……

  到达汨罗山已是上午10点了,只见一片起伏连绵的丘陵由东向西朝玉笥山逶迤而去。几千年了,一个用诗书写民生、以命明志的爱国诗人就在这里枕着江流长眠在这一片青黛之中。

  艳阳照射在屈原的墓碑上,斑驳陆离,像一位耄耋老人满脸起了寿斑。碑面的字迹尚可辨认,碑阴则无一字说明,历史就像这墓碑一下子简单得不能再简单。我来到赵家冲后的一座屈原墓前,据说这是

12座疑冢中最为壮观的一座,碑文为“故楚三闾大夫之墓”。读着这仅有的所谓的碑文,只觉得古代华夏子孙对此颇费过思量。中国的墓葬历来对身份有讲究,往往有一些重要的个人信息从墓碑上选出。据唐杜佑《通典》记载:屈原冢有石碑,文为“楚放臣屈大夫之墓”,后来碑佚。过去的那些古碑都随着岁月的流逝或损毁或散佚了,而今存传的尽是近代人的重建。这让我有机会作一次比较。唐代屈原墓碑标示的是“楚放臣”,这个身份是很明确的,让人一看就明白屈原是楚国被放逐之臣。看不到其他褒贬文字的墓志铭。清朝同治年间刊立的屈原碑,碑文则很中性,称屈公为“故楚三闾大夫”,只标明了身份。同是屈公之墓,而碑文几字之差,让人觉得感情色彩大异。

  在汨罗山1500平方米的范围里,屈原疑冢如种瓜种豆般散布其中,其墓或大或小,其碑或高或矮,但这并不影响我对先

生的仰慕,它们给我的更多是一种精神向度与高度。

  凝望荒草萋萋的屈原墓,眼前总好像晃动着楚国高大的城池与屈公形容枯槁的身影。其实春秋时期楚国还是很强大的,即使是战国时期,它的疆土仍在争战中不断膨胀扩展。太史公有《史记》述:“楚,天下之强国也……地方五千余里,带甲百万,车千乘,骑万匹,粟支十年。”屈原是在战国时期七雄纷争、秦强楚弱的形势下,抱着改革政治、富国强兵的雄心壮志,力图让楚国一统天下的。他主张彰明法度,举贤授能,东联齐国,西抗强秦,但楚怀王昏庸无道,再加上反动贵族令尹子兰、上官大夫靳尚、宠姬郑袖等佞臣小人的围攻,他的政治理想不能实现。在苟且偷安、惧战主降的贵族们的打击排斥下,斗争处于劣势的屈原最终因谗言被罢官、放逐,长期流浪于沅湘流域。一个人的政治才能不能充分得以施展,政治抱负不能得以实现,何其郁郁!屈子被放逐汨罗江畔9年余,报国无门,每日只能披发行吟于江边,北望郢都,思念祖国,愤然怅然写下许多不能打动楚王的文字。当秦军攻下郢都的消息从远方传来,他痛不欲生,万念俱灰。  

  屈原死后,太史公曾到屈公生前垂钓和行吟的江暮潭凭吊,痛哭而流涕。贾谊赴长沙王太傅任途经此地亦唏嘘掩泣,作《吊屈原赋》。屈原的弟子宋玉还登上玉笥山之最高处,为先生招魂。时逾几千年,作为先生的崇拜者,我只身来到屈公墓前,虽然不知哪座冢内真正埋着诗人的骨骸,但我想整个汨罗山,不,整个华夏山水都有他的忠魂!每到一座疑冢,我都宁可相信这是一座真坟。我采撷一束满山疯长的艾蒿和牡荆,献到屈公的墓碑前。要知道,这艾蒿是每年端午节人们必采之物,而牡荆,则早在周时它的名字就叫“楚”啊!

  汨罗山下那一块百亩见方的水塘,我想就应该是当年女嬃取土造坟的楚塘了。楚塘之名也是后人命的,人们赋予了它时代色彩与政治意义。楚塘如今芰荷蓬勃,水草丛生,汨罗山满山遍野的艾蒿何其葳蕤,是专为纪念屈子生长的吗?(选自《人民日报》)

1.细读文章第一段,说说作者为什么想从洞庭湖出发沿汨罗江逆流而上去寻访屈原。

答:_____________________________________________________

2.读文章中的画线句,简要说说“同是屈公之墓,而碑文几字之差,让人觉得感情色彩大异”中的“异”字所指代的内容。

答:_____________________________________________________

3.品读全文,分析“每到一座疑冢,我都宁可相信这是一座真坟”一句所包含的作者的感情。

答:_____________________________________________________

4.简要探究作者在文末写“芰荷蓬勃”“艾蒿”“葳蕤”的意图。

答:_____________________________________________________

题型:单项选择题

Katharine Houghton Hepburn was born in Hartford in 1907. The Hepburns made sure to educate their children about important political and social subjects and sports. She rode horses, swam and played golf and tennis.

Katharine graduated from Bryn Mawr College in 1928. She soon started appearing in small roles in plays. After a few successful plays, Hollywood filmmakers became interested in her. She later signed with RKO Pictures. Her first movie came out in 1932.

The next year she acted in the film Morning Glory. This gave her the chance to let her acting skills shine. This movie earned Hepburn her first Academy Award for Best Actress.

During the 1930s, critics(评论家) either loved or hated Katharine Hepburn. But Hepburn wanted to face the movie industry in her own way. She did not want to be like other actresses. She did not wear make-up on her face. She would not let photographers take sexy pictures of her.

By the late 1930s, she had become unpopular with the public. But Hepburn was not raised to quit easily. She starred in The Philadelphia Story in 1940. For this movie, Hepburn received another Academy Award nomination(提名) for Best Actress. She had taken control of her career once again.

In 1967, she starred in her last movie with Spencer Tracy. For this movie, Guess Who’s Coming to Dinner, she won her second Academy Award. She won her third Academy Award the next year for A Lion in Winter. And, in her mid-seventies she won her last Academy Award for On Golden Pond.

Even into her eighties, she kept working. She also wrote several books. In 2003, Katharine Hepburn died.

As part of her last wishes, she helped create the Katharine Houghton Hepburn Center to help support the things that were important to her: film and theater, women’s right, and civic(国民的) responsibility.

1. What do we learn about Katharine Hepburn from the passage?

A. As a little girl, she showed a gift for acting.

B. She was well educated when she was young.

C. She stopped working in her mid-seventies.

D. Her small roles in plays were not good for her movie career.

2. The following movies all won Katharine Hepburn an Academy Award for Best Actress EXCEPT_______.

A. Morning Glory                B. A Lion in Winter

C. The Philadelphia Story     D. Guess Who’s Coming to Dinner

3. Which of the following words can best describe Katharine Hepburn?

A. Humorous but mean.        B. Independent and successful.

C. Beautiful but unpopular.   D. Strict and inexperienced.

4. The passage is developed by______.

A. space order         B. comparison         C. time order        D. listening examples

题型:单项选择题

对生态系统中能量流动与物质循环的关系描述正确的是( )。

A.生态系统中生命成分的生存和繁衍,既需能量,也需从环境中得到生命所需的营养物质

B.生态系统的能量流和物质流紧密结合,共同运行,维持着生态系统的生长发育和进化演替,对生态系统而言,两者缺一不可

C.物质是能量的载体,物质是能量运动的动力

D.没有物质,能量虽不会自由散失,但也不可能沿着食物链传递

E.没有物质,能量就会自由散失,不可能沿着食物链传递

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