搜题请搜索小程序“爱下问搜题”
问题 选择题

如图，P是位于水平的粗糙桌面上的物块，用跨过定滑轮的轻绳将P与小盘相连，小盘内有砝码，小盘与砝码的总质量为m。在P运动的过程中，若不计空气阻力，则关于P在水平方向受到的作用力与相应的施力物体，下列说法正确的是

[ ]

A．拉力和摩擦力，施力物体分别是地球和桌面

B．拉力和摩擦力，施力物体分别是绳和桌面

C．重力mg和摩擦力，施力物体分别是地球和桌面

D．重力mg和摩擦力，施力物体分别是绳和桌面

答案

答案：B

单项选择题

急性弥漫性毛细血管内增生性肾小球肾炎时肾小球内增生的细胞主要是()

A．肾球囊脏层上皮细胞及系膜细胞

B．肾球囊脏层上皮细胞和壁层上皮细胞

C．肾球囊壁层上皮细胞及毛细血管内皮细胞

D．肾小球毛细血管内皮细胞和系膜细胞

E．肾小球周围的成纤维细胞
查看答案
问答题



1.Passage 1
Mr. Chairman, Excellencies, Ladies and Gentlemen,
I should like, first of all, to once again thank the Norwegian Nobel Committee for the award they have made to the United Nations Peace-Keeping Operations. Their decision has been acclaimed all over the world. I take this opportunity also to express once again my deep gratitude to the countries, which have contributed troops or provided logistical support to these operations. It is to their willing cooperation that we owe the success of this great experiment in conflict control.
Peace--the word evokes the simplest and most cherished dream of humanity. Peace is, and has always been, the ultimate human aspiration. And yet our history shows that while we speak incessantly of peace, our actions tell a very different story. Peace is an easy word to say in any language. As Secretary-General of the United Nations, I hear it so frequently from so many different mouths and different sources, that it sometimes seems to me to be a general incantation more or less deprived of practical meaning.
What do we really mean by peace Human nature being what it is, peace must inevitably be a relative condition. The essence of life is struggle and competition, and to the extent perfect peace is an almost meaningless abstraction. Struggle and competition are stimulating, but when they degenerate into conflict they are usually both destructive and disruptive. The aim of political institutions like the UN is to draw the line between struggle and conflict and to make it possible for nations to stay on the right side of the line. Peace-keeping operations are one very practical means of doing this.
What we are trying to create in the LIN is a world where nations recognize at the same time the ultimate futility of war and the collective responsibility that men and women everywhere share for ensuring a decent future. All human experience seems to show that in international, as in national, affairs, rule of law is an essential objective for any society wishing to survive in reasonable conditions. We now recognize that all humanity--the whole population of this planet--has in many respects become, through the revolutionary force of technological and other changes, a single society. The evolution of international law and international authority may well be decisive in determining whether this global society is going to survive in reasonable conditions. In a larger perspective, we must work towards a time when war will cease to be an acceptable option of national policy or a possible means of settling disputes, and when a reliable international system will take its place. From this perspective, the development of international peacekeeping has an essential place, just as the concept of a civil police was essential to the development of rule of law within nation states. I hope that the attention now being given to peacekeeping, which is symbolized by the award of the Nobel Peace Prize, will not only strengthen our capacity to conduct the affairs of nations but also stimulate a wider effort to consider the new means and the new institutions needed to ensure a better common future. Thank you.
查看答案