地铁停电疏散时,乘客应该按照工作人员的指引顺序下车,不要拥挤,依次沉着冷静地走上地面

题型:问答题

问题:

地铁停电疏散时,乘客应该按照工作人员的指引顺序下车,不要拥挤,依次沉着冷静地走上地面。地铁列车车门上方的“紧急开门手柄”不能擅动。如列车正好停靠站台,可拉下“紧急开门手柄”,但一旦列车停在隧道中时拉下,会十分危险。地铁站台和通道内均设有明显的疏散指示标志。

考点:计算机等级考试B笔试全国计算机等级考试一级B真题2010年3月
题型:问答题

Modern liberal opinion is sensitive to problems of restriction of freedom and abuse of power. (1) , many hold that a man can be injured only by violating his will, but this view is much too (2) . It fails to (3) the great dangers we shall face in the (4) of biomedical technology that stems from an excess of freedom, from the unrestrained (5) of will. In my view, our greatest problems will be voluntary self-degradation, or willing dehumanization, as is the unintended yet often inescapable consequence of sternly and successfully pursuing our humanization (6) .

Certain (7) and perfected medical technologies have already had some dehumanizing consequences. Improved methods of resuscitation have made (8) heroic effort to "save" the severely ill and injured. Yet these efforts are sometimes only partly successful: They may succeed in (9) individuals, but these individuals may have sever brain damage and be capable of only a less-than-human, vegetating (10) . Such patients have been (11) a death with dignity. Families are forced to bear the burden of a (12) "death watch".

(13) the ordinary methods of treating disease and prolonging life have changed the (14) in which men die. Fewer and fewer people die in the familiar surroundings of home or in the (15) of family and friends. This loneliness, (16) , is not confined to the dying patient in the hospital bed. As a group, the elderly are the most alienated members of our society: Not yet (17) the world of the dead, not deemed fit for the world of the living, they are shunted (18) . We have learned how to increase their years, (19) we have not learned how to help them enjoy their days. Yet we continue to bravely and feverishly push back the frontiers (20) death.

4()

A.allocation

B.expense

C.restriction

D.availability

题型:问答题

鲜血自直肠排出称为 __________ ,通常提示出血来自 __________ 。

题型:问答题

酸性气预热器折流板间距是()mm。

A、520

B、500

C、450

D、510

题型:问答题

患者男,30岁,诉自发性牙痛2天,口含冰块可暂时缓解,拟诊为

A.急性根尖周炎
B.急性牙髓炎化脓期
C.急性冠周炎
D.急性牙周脓肿
E.可复性牙髓炎

题型:问答题

阅读下面短文,回答下列问题。
目前,制造微型电子元件的方法一般是从大块的半导体材料上切割下所需要的原料,然后在上面刻蚀出电路。美国得克萨斯大学奥斯汀分校的安杰拉·贝尔彻等人最近在英国《自然》杂志上发表报告说,他们的新研究成果使制造更复杂、更精密的电子元件成为可能。
科学家已经掌握了制造半导体纳米晶体的技术。半导体纳米晶体是一种分子团,仅有几纳米大小,比目前微电路中使用的晶体管小得多。一块纳米晶体能够充当一个开关或一个存储单元,将它们组合起来就能制造出电子元件。但纳米晶体比细菌还小,如何对它们进行挑选、传送和拼装等操作呢在生命体中,有时候一个细胞会发送出一个小型分子团,蛋白质则像“交通工具”一样将其运送到另一个细胞。科学家想,如果给蛋白质装备能选择不同半导体材料的分子,就可以利用这一原理对半导体纳米晶体进行操作。
贝尔彻等人通过化学反应随机产生了约10亿种不同的多肽分子,从中筛选出了那些能与半导体材料表面结合的分子,然后对这些分子进行结构改造,使其与半导体的亲和力更强。经过5轮筛选和培育,他们已经获得了能与镓砷半导体紧密结合而不与硅等其他材料结合的多肽分子。
理论上,将这种多肽分子与蛋白质结合,就能从半导体材料“仓库”中挑选出镓砷纳米晶体,运送到“建筑工地”,添加在未完成的“建筑物”上。如果进一步筛选出与其他半导体材料或掺杂剂结合的多肽分子,就能组成一支完整的“施工队”,从事微电子元件的组装工作。不过专家表示,这一技术离实用化尚有相当长的距离。

下列说法符合原文意思的一项是______。

A.掌握了制造半导体纳米晶体的技术,就可以制造更复杂、更精密的电子元件

B.贝尔彻等人通过5轮筛选,得到了能与镓砷半导体紧密结合的多肽分子

C.有了能与镓砷半导体紧密结合而不与硅等其他材料结合的多肽分子,并筛选出与其他半导体材料或掺杂剂结合的多肽分子,就可能从事微电子元件的组装工作

D.组装微电子元件技术还没有完善,因此这一技术不能进入应用阶段

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