烧伤后应激性溃疡的发病机制中最重要的因素是() A.黏膜灌流量减少和灶性缺血 B.胃

题型:单项选择题 A1/A2型题

问题:

烧伤后应激性溃疡的发病机制中最重要的因素是()

A.黏膜灌流量减少和灶性缺血

B.胃黏膜前列腺素改变

C.胃酸分泌

D.黏膜屏障功能损伤

E.氧自由基产生和释放

考点:普通外科主治医师相关专业知识烧伤外科学烧伤外科学题库
题型:单项选择题 A1/A2型题

氨合成反应的最适宜温度是()出现最大反应速度时的温度。

题型:单项选择题 A1/A2型题

患者急性中毒有机磷杀虫剂中毒第3天,患者已清醒,维持阿托品化状态,出现抬头困难、抬臂困难,呼吸困难,无流涎,双瞳孔5mm大小,肺部无干湿啰音,监护示血氧饱和度下降。

此时,该病例诊断应高度考虑()

A.迟发性神经病

B.阿托品中毒

C.中毒反跳

D.阿托品用量不足

E.中间综合征

题型:单项选择题 A1/A2型题

Until recently, the "science of the future" was supposed to be electronics and artificial intelligence. Today it seems more and more likely that the next great breakthroughs in technology will be brought through a combination of those two sciences with organic chemistry and genetic engineering. This combination is the science of biotechnology.

Organic chemistry enables us to produce marvelous synthetic materials. However, it is still difficult to manufacture anything that has the capacity of wool to conserve (保存) heat and also to absorb moisture. Nothing that we have been able to produce so far comes anywhere near the combination of strength, lightness and flexibility that we find in the bodies of ordinary insects.

Nevertheless, scientists in the laboratory have already succeeded in "growing" a material that has many of the characteristics of human skin. The next step may well be "biotech hearts and eyes" which can replace diseased organs in human beings. These will not be rejected by the body, as is the case with organs from humans.

The application of biotechnology to energy production seems even more promising. In 1996 the famous science fiction writer, Arthur C. Clarke, many of whose previous predictions have come true, said that we may soon be able to develop remarkably cheap and renewable sources of energy. Some of these power sources will be biological. Clarke and others have warned us repeatedly that sooner or later we will have to give up our dependence on non-renewable power sources. Coal, oil and gas are indeed convenient. However, using them also means creating dangerously high levels of pollution. It will be impossible to meet the growing demand for energy without increasing that pollution to catastrophic (灾难性的) levels unless we develop power sources that are both cheaper and cleaner.

It is attempting to think that biotechnology or some other "science of the future" can solve our problems. Before we surrender to that temptation we should remember nuclear power. Only a few generations ago it seemed to promise limitless, cheap and safe energy. Today those promises lie buried in a concrete grave in a place called Chernobyl, in the Ukraine. Biotechnology is unlikely, however, to break its promises in quite the same or such a dangerous way.

小题1:According to the passage, the science of the future is likely to be ________.

A.electronics

B.biotechnology

C.genetic engineering

D.nuclear technology小题2:The materials produced with organic chemistry are ________.at present.

A.as good as wool

B.as good as an insect's body

C.better than natural materials

D.not as good as natural materials小题3:According to the passage, it may soon be possible ________.

A.to transplant human organs

B.to make artificial hearts and eyes

C.to produce drugs without side effects

D.to make something as good as human skin小题4:In 1996, Arthur C. Clarke predicted that_______.

A. the Chernobyl disaster would happen in two years

B. we will never stop using non-renewable power sources biological  

C. oil, gas and coal could be repeatedly used in the future

D. power sources would be put into use soon

小题5:What do we learn from the last paragraph?

A.Biological power will keep all its promises.

B.Biological power is cheaper than nuclear power.

C.Biotechnology can solve all our future energy problems

D.Biological power may not be as dangerous as nuclear power

题型:单项选择题 A1/A2型题

单位面积相同的情况下,养殖产量最高的是().

A、高产池塘

B、网箱

C、水库

D、网拦库汊

题型:单项选择题 A1/A2型题

毛坯尺寸与零件图对应尺寸之差称为工序余量。( )

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