近点

题型:名词解释

问题:

近点

考点:电气工程公共基础第三节光学第三节光学题库
题型:名词解释

植物生命活动调节的基本形式是激素调节,请据图回答有关植物激素的问题。

(1)农业生产中,用一定浓度的生长素类似物作为除草剂,可以除去单子叶农作物田间的双子叶杂草。甲图中,可表示单子叶植物受不同浓度生长素类似物影响的是曲线_______,可选用图中_______点所对应浓度的生长素类似物作为除草剂。

(2)研究人员用一定浓度的CaCl2溶液和赤霉素对某植物种子胚轴生长的影响进行了相关实验,结果如乙图所示。由图可知,一定浓度的CaCl2溶液对胚轴的生长具有_______作用。根据赤霉素的生理作用推测,实验中加入赤霉素溶液的时间应在图中的_______点。

(3)将大小相近的同种植物分为①②③三组,分别进行不同的处理,实验结果如丙图所示。根据①③组结果可得出的结论是______;继而将②组结果与①③组进行比较,可得出的结论是_________________。

(4)科研人员利用某些植物,研究植物生长的不同阶段体内各种植物激素的作用。列举部分结果如下:

由表可以看出,植物生长的不同阶段都是受_______________。

题型:名词解释

下列选择窗体控件对象操作正确的是( )。

A.单击可选择一个对象

B.按住Shift键再单击其他多个对象可选定多个对象

C.按Ctrl+A键可以选定窗体上所有对象

D.以上皆是

题型:名词解释

Young women are more adventurous than young men when travelling abroad in gap years. One in three female backpackers visits more than three countries during a year out and travels alone, according to new research.

By contrast, the majority of their male counterparts visit only one country and tend to travel in groups, says a survey by the Gap Year company, which provides information and services for students considering taking a year out.

More women than men say that their prime reason for taking time off is to see the world and experience different cultures. Men were more likely to rank “having fun” higher on their list of priorities. Women were more likely to value the challenge of a foreign trip, and many cited reasons such as learning a language and meeting new people.

The more adventurous gap years taken by women seem to work to their benefit: more than three quarters of those surveyed reported increased confidence, self-reliance and inde­pendence, whereas only half of the men had that experience.

The research also showed that women were more likely to do voluntary work while trav­elling, with more than one in ten helping with teaching or development projects. One of the reasons given for this is a wish to see the country in an authentic light.

A greater proportion of women than men faced objections or criticism from their fami­lies over their gap-year plans. Among the men surveyed, lack of money was the main barrier to travel.

Carolyn Martin, a doctor from London, was a typically confident female traveller.

Starting in Cape Town, she travelled around southern Africa and Australia with a string of

unusual and sometimes dangerous jobs.

“I had one job chasing elephants off the runway in Africa by banging a stick against a pan,” she recalled. “It was OK but one day I did get chased by one.”

She said that she had travelled alone because “you meet more people”.

46. By referring to “gap year” the writer means ______.

A. a gap you come across after leaving high school

B. a time when you are caught in a dilemma between work and study

C. a period before you find a job upon your graduation from college

D. a year off between high school and college for certain purposes

47. According to the article, ______.

A. most of the women students will travel abroad during the summer holidays

B. one third of the women students will travel abroad in a year

C. women students are more likely to travel abroad alone

D. women students are willing to travel abroad in a group

48. In the third paragraph, the underlined word “priorities” most probably means ______.

A. selections     B. attractions    C. preferences     D. projects

49. Which of the following statements is TRUE?

A. Men students will travel less during the gap year because of their part-time jobs.

B. Women students will travel more but face more objections.

C. The article suggests that women travelling alone will have dangerous experi­ences.

D. Men students prefer to travel inside their own country to going abroad.

50. Which of the following would be the best title for the passage?

A. Girls Get the Best out of Gap Years   B. Boys Lack Courage in Gap Years

C. For Fun or for Adventure?          D. Young Women Are More Adventurous

题型:名词解释

属于基因诊断及治疗所带来的伦理问题是()。

A.胎儿生命权与父母选择权可能出现冲突

B.人类遗传物质的纯洁性、神圣性是否受到了亵渎

C.诊断及治疗时导入的基因如何正确表达

D.对个体和人类社会是否安全

E.生殖细胞的基因治疗是否可行

题型:名词解释

在建设工程项目管理的基本概念中,“进度目标”对业主而言是()的时间目标

A.竣工

B.调试

C.试生产

D.动用

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