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1.
本文根据高考考纲要求,主要讲述了海洋资源的主要类型及其开发利用现状与前景以及主要的海洋环境问题和保护海洋环境的主要措施。  相似文献   

2.
介绍了国际生态旅游实践的主要地域和主要经验,论述了中国生态旅游开发的主要区域。  相似文献   

3.
本文主要讲述对下一代网络技术进行了越来越多的研究,主要介绍了软交换概念及其网络结构、软交换的主要协议、软交换系统的主要功能和软交换技术在电力通信系统中的应用。  相似文献   

4.
王蕾蕾  康霞 《甘肃科技》2014,(14):28-29
青田石是我国重要的玉石种类之一,选取青田石的几个主要品种,对其进行常规宝石学特征以及大型仪器测试,结果表明:所选青田石样品结构细腻,主要组成矿物均为显微鳞片状集合体。所选样品中封门黄、红花冻的主要矿物成分为叶蜡石;紫檀冻主要由叶蜡石和绢云母组成;蓝星的主要组成矿物为叶蜡石和伊利石;山炮绿的矿物成分主要为绢云母;珍珠冻的主要矿物组成为红柱石和叶腊石。  相似文献   

5.
明确党委和政府主要领导干部经济责任同步审计重点,是做好党委和政府主要领导干部经济责任同步审计工作的基础。文章对党委和政府主要领导干部经济责任同步审计重点进行了初步探讨,分别从党委主要领导干部经济责任审计的重点和政府主要领导干部经济责任审计的重点两个方面进行了阐述。  相似文献   

6.
文章从六个方面论述了在生理实验教学中选择性使用教学方法的心得体会,其中的客观演绎主要是为了培养医学生的观察分析能力,主观归纳主要是为了培养医学生的判断总结能力,强调指法要点主要是为了传授重要的技能元素、强调手法要点主要是为了传授重要的技能组合,强调身法要点主要是为了传授重要的技能体系,强调心法要点主要是为了传授重要的技能诀窍.  相似文献   

7.
本文研究了机场运营信息化和管理信息化建设的主要内容,提出了南京禄口国际机场信息化建设的主要目标和系统主要功能,对系统设计的主要内容进行了介绍,通过先进实用的信息技术,使机场生产与管理水平走向国际化。  相似文献   

8.
城市快速路主要联系市区各主要地区、主要近郊区、卫星城镇、主要对外公路等,快速路总体设计是在整个快速路设计中的一大重要环节,通过对合肥市阜阳北路(东方大道-北外环高速)段快速化改造的研究,浅谈城市快速路总体设计的要点,城市快速路总体设计的要点主要包含功能定位、主要技术标准、横断面布置、道路总体平面、关键性节点设计、出入口设置.  相似文献   

9.
麻建省 《甘肃科技》2014,(14):54-55
主要介绍了目前国内主要地铁车辆制动系统的发展经历,并分析了国产制动系统发展不起来的主要原因。  相似文献   

10.
大量使用矿物燃料是全球变暖的主要原因,而火力发电厂燃煤是温室气体的主要来源之一。因此,火电厂二氧化碳的捕集再利用再一次成为全球关注的主要问题。该文主要介绍了燃煤电厂CO2捕集工艺技术,主要包括CO2分离、工艺流程、吸收液和吸附剂的选择等,并介绍了碳捕集回收再利用工艺。  相似文献   

11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women's language from these perspectives: pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women's language, more attention should be paid to language use in social context. What's more, the linguistic phenomena in a speaking community can be understood more thoroughly.  相似文献   

13.
王慧 《科技信息》2008,(10):240-240
Wuthering Heights, Emily Bronte's only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.  相似文献   

14.
The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.  相似文献   

15.
理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。  相似文献   

16.
As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.  相似文献   

17.
正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-  相似文献   

18.
We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-  相似文献   

19.
正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that  相似文献   

20.
<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with  相似文献   

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