材料的疲劳性能指标是()。A、延伸率 B、疲劳极限 C、断面收缩率 D、刚度

题型:单项选择题

问题:

材料的疲劳性能指标是()。

A、延伸率

B、疲劳极限

C、断面收缩率

D、刚度

考点:眼镜定配工中级眼镜定配工中级眼镜定配工题库
题型:单项选择题

一个空心的铜球重5牛,体积为0.6×10-33,它在水中将______(填“上浮”、“下沉”或“悬浮”),静止时所受的浮力是______.

题型:单项选择题

以下关于光的有关说法中正确的是()。

A.光导纤维是应用了光的全反射现象,无影灯主要是应用了光的衍射

B.天空中出现的彩虹是因为光的折射形成色散现象

C.自然光是光振动沿各个方向均匀分布的光,偏振光是光振动沿着特定方向的光

D.现在我们知道,光就是一份一份的能量

题型:单项选择题

某企业的产品全部定位为儿童卫生用品,则其采用的竞争战略方案为( )。

A.差异化战略方案

B.成本领先战略方案

C.转移型战略方案

D.集中化战略方案

题型:单项选择题

目前,你在管理一个项目,该项目旨在重新设计零售商店的分布以改善顾客的流量及提高效率。很多工作必须在现场完成,并且需要店员的积极参与。这些店员中的很多人是一个工会的成员,该工会因工人运动而著名。你计划的一个重要组成部分必须是()。

A.一个资源容量矩阵

B.缓冲和储备

C.一个资源日历

D.一个资源柱状图表

题型:单项选择题

In one very long sentence, the introduction to the U. N. Charter expresses the ideals and the common aims of all the people whose governments joined together to form the U. N.

"We, the people of the U. N. , determined to save succeeding generations from the scourge of war which twice in our lifetime has brought untold suffering to mankind, and to reaffirm faith in fundamental rights, in the dignity and worth of the human person, in the equal rights of men and women and of nations, large and small, and to establish conditions under which justice and respect for the obligations arising from treaties and other sources of international law can be maintained, and to promote social progress and better standards of life in larger freedom, and for these ends, to practise tolerance and live together in peace with one another as good neighbours, and to unite our strength to maintain international peace and security, and to ensure, by the acceptance of principles and the institution of methods, that armed force shall not be used, save in the common interest, and to employ international machinery for the promotion of economic and social advancement of all peoples, have resolved to combine our efforts to accomplish these aims."

The name "United Nations" is accredited to U. S. President Franklin D. Roosevelt, and the first group of representatives of member States met and signed a declaration of common intent on New Year’s Day in 1942. Representatives of five powers worked together to draw up proposals, completed at Dumbarton Oaks in 1944. These proposals, modified after deliberation at the conference on International Organization in San Francisco which began in April 1945, were finally agreed on and signed as the U.N. Charter by 50 countries on 26 June 1945. Poland, not represented at the conference, signed the Charter later and was added to the list of original members. It was not until that autumn, however, after the Charter had been ratified by China, France, the U. S. S. R. U. , the U.K. and the U. S. and by a majority of the other participants that the U. N. officially came into existence. The date was 24 October, now universally celebrated as United Nations Day.

The essential functions of the U. N. are to maintain international peace and security, to develop friendly relations among nations, to cooperate internationally in solving international economic, social, cultural and human problems, promoting respect for human rights and fundamental freedoms and to be a centre for co-ordinating the actions of nations on attaining these common ends.

No country takes precedence over another in the U. N. Each member’s rights and obligations are the same. All must contribute to the peaceful settlement of international dispute, and members have pledged to refrain from the threat or use of force against other states.

Which of the following is true as to the essential functions of the U. N()

A. It’s only concerned with human rights

B. It only solves economic and cultural problems

C. It co-ordinates actions of nations where necessary

D. It only aims to develop friendly relations

更多题库