SF6气体分解产物检测过程中,检测仪应在检测合格报告有效期内使用,需()进行校验。

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问题:

SF6气体分解产物检测过程中,检测仪应在检测合格报告有效期内使用,需()进行校验。

A.每年

B.2年

C.3年

D.4年

考点:变电五通考试变电五通考试题库
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男性,19岁,近半年来出现食欲下降、腹胀、恶心、乏力、双手震颤、运动迟缓,查体:注意力差、贫血貌、慌张步态,肝脾肿大、四肢肌张力高伴反射亢进。

除哪项症状外本病都可出现()

A.肝脾肿大

B.精神神经症状

C.肾脏症状

D.失明

E.血液系统症状

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简述邓 * * 关于社会主义本质论断的特点。

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以下各项中,( )是具有物权凭证作用的单据。

A.航空运单

B.铁路运单

C.商业发票

D.提单

题型:单项选择题

Many people are concerned about the economic condition of developing countries — countries whose average per capita GNP is a fraction of that in more industrialized countries. However, for the developing countries, there exist many obstacles to their economic development.
One major obstacle to economic development is population growth. (46) The populations of most developing countries grow at a rate much faster than those of industrialized countries, and the population of some of them is so large that there is barely enough fertile land and other resources to support it. Many less developed countries depend extensively on agriculture, adding to the problem. In these countries, an incentive to have many children exists. (47) Most farms are worked by families, and children can work in the fields at an early age because most farmers believe that more children means more workers. In addition, having many children ensures the parents that someone will look after them in their old age.
Another problem for developing countries is increasing average life expectancy—the average remaining lifetime for persons who reach a certain age. Better education, international aid, and emphasis on health-care facilities help people live longer. A high life expectancy coupled with a high crude birthrate makes it difficult to increase per capita GNP.
Another obstacle to economic growth is limited natural resources. No country can develop beyond its resource potential. Unproductive land or a harsh climate can limit economic growth. (48) Some countries may be fortunate enough to discover a valuable mineral to finance their economic development, but most focus on agriculture and, as a result, their economic growth is hindered by the shortage of natural resources or energy sources needed for industry.
Still another obstacle to economic development is a lack of appropriate education and technology. Any developing countries do not have a highly literate population or the high level of technical skills needed to build an industrial society. In addition, most do not have money to train engineers and scientists. (49) Many developing countries cannot even afford to provide free public education for school-age children, and in those that can, not every child is able to take advantage of it because most of them have to work to help feed their families. As a result, much of the population may not have the basic skills needed to continue with higher education when it is offered.
Government also can be an obstacle to economic development. A country whose government often changes will have a hard time developing economically. Such constant changes impede long-term planning. (50) Economic development is made even more difficult if the political changes occur through violent revolution where industrial facilities may be destroyed.

题型:单项选择题

王国维在《宋元戏曲考》中说:“盖自唐宋以来,士之竟于科目者,已非一朝一夕之事。一旦废之,彼其才力无所用,而一于词曲发之。……适杂剧之新体出,遂多从事于此……充其才力,而使元剧之作,遂为千古独绝之文字。”这一材料实质上揭示了()

A.元杂剧兴盛的直接原因

B.文化发展与时代变迁的关系

C.科举考试在元代式微

D.元杂剧空前绝后的历史地位

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