一束光线垂直射到平面镜上,其反射角是______度,光的传播方向改变了_____

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问题:

一束光线垂直射到平面镜上,其反射角是______度,光的传播方向改变了______度角.若入射光不变,平面镜绕入射点转过15°,则反射光线转过______度角.

考点:光的反射规律及其应用
题型:填空题

下列词语中加线字的读音正确的一组是(   )

A.我细细观赏它(qiān)细的脉络,嫩芽,我以(yà)苗助长的心情,巴不得它长得快,长得茂绿。

B.诸君(yì)业于此,或三年,或四年,时间不为不多,苟能爱惜光阴,孜孜求学,则其造(zhǐ),容有底止。

C.一个人(jiā)在苏州上海杭州,或厦门香港广州的市民中间,(hùn)混沌沌地过去,只能感到一点点清凉。

D.我今天有一个梦想。我梦想有一天,幽谷上升,高山下降,坎(kě)(qǔ)折之路成坦途,圣光披露,满照人间。

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患者男,60岁。吸烟史20支/天×15年。因咳嗽,咳痰,气促5年,加重并发热1周入院。入院查体:唇发绀,颈静脉充盈,桶状胸,双肺散在哮鸣音,肺底湿啰音,HR100次/分,律齐,下肢浮肿。血WBC1.2×109/L,中性粒细胞80%,淋巴细胞20%,Hb160g/L,HCT45%。血气分析:pH7.40,PaO260mmHg,PaCO260mmHg,Na+135mmol/L,K+3.7mmol/L,Cl-96nmol/L。适合的治疗措施是()

A.适当利尿治疗

B.祛痰平喘治疗

C.持续性低流量给氧

D.抗感染治疗

E.扩血管治疗

题型:填空题

男性,22岁,血压19/12kPa,大量尿蛋白,血浆清蛋白25g/L,下列何种疾病可能性大()

A.隐匿性肾炎

B.高血压肾小动脉硬化

C.急性肾炎

D.肾病综合征

E.慢性肾炎

题型:填空题

当前,文化市场在满足人民日益增长的文化需要的同时,出现了“娱乐化”“低俗化”的倾向。作为公民,在文化消费时,我们应当()

①提升自身的文化审美品位

②加强社会主义核心价值体系建设

③选择有个性又新潮的文化

④提高辨别不同性质文化的眼力

A.①②

B.①④

C.①③

D.③④

题型:填空题

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.

(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.

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