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【单选题】
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. Under its Charter, the first stated aim of the U.N. was ______.
A.
to promote social progress
B.
to prevent a third world war
C.
to revise international laws
D.
to maintain international peace
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举一反三
【单选题】三极管处于截止状态时
A.
发射结正偏、集电结正偏
B.
发射结正偏、集电结反偏
C.
发射结反偏、集电结正偏
D.
发射结反偏、集电结反偏
【简答题】三极管处于饱和状态时,其集电结处于()状态,三极管处于截止状态时,其基极电流应为()。
【多选题】电工××在整理临时用电线路时,由于现场线路布局杂乱,多处破损并接头外露,没及时处置,因漏电碰触后死亡。事故教训及防范措施:
A.
应采用绝缘良好的导线,严禁乱架乱拉,接头处按工艺要求做
B.
填写工作票,装设接地线
C.
对临时线路要加强安全管理,严格实行审批手续,使用期限为15天,逾期办理手续定人定时日常检查
D.
有可能触及到的线路架空或穿管铺设,电源处装漏电保护器,临时装置安全可靠
【多选题】电工某某在整理临时用电线路时,由于现场线路布局杂乱,多处有破损并接头外漏,没及时处理,因漏电碰触后死亡,事故教训及防范措施()
A.
应采用绝缘良好的导线,严禁乱架乱拉,接头处按工艺要求做
B.
填写工作票,装设接地线
C.
对临时线路要加强管理,严格实行审批手续,试用期为15天,逾期办理手续定人定时日常检查
D.
有可能触及到的线路架空或穿管铺设,电源处装漏电保护器,临时装置安全可靠
【多选题】某机场采用架空线路供电,因有人盗割造成铁塔倾倒事故,对此可采取()措施。
A.
定期巡视检查
B.
每个塔下派人看守
C.
加装防盗报警装置
D.
更换成直埋电缆
【简答题】三极管处于截止状态时,( )。
【简答题】仿照如下页面制作春夏秋冬四个页面,春夏秋冬取自散文,同学们自行百度。
【单选题】NPN型三极管处于截止状态时有
A.
Vc>Ve>Vb
B.
Vc>Vb>Ve
C.
Vb>Vc>Ve
D.
Vb>Ve>Vc
【单选题】下述上颌中切牙牙根的描述中错误的是
A.
单根粗而直
B.
颈部横切面呈椭圆形
C.
唇面宽于舌面
D.
根尖较直或略偏远中
E.
根长稍大于冠长或等于冠长
【单选题】三极管处于截止状态时, 。
A.
发射结正偏,集电结反偏
B.
发射结正偏,集电结正偏
C.
发射结反偏,集电结反偏
D.
发射结反偏,集电结正偏
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