全文获取类型
收费全文 | 35166篇 |
免费 | 583篇 |
国内免费 | 47篇 |
专业分类
教育 | 24782篇 |
科学研究 | 3410篇 |
各国文化 | 348篇 |
体育 | 3116篇 |
综合类 | 19篇 |
文化理论 | 283篇 |
信息传播 | 3838篇 |
出版年
2022年 | 245篇 |
2021年 | 406篇 |
2020年 | 584篇 |
2019年 | 859篇 |
2018年 | 1212篇 |
2017年 | 1153篇 |
2016年 | 1063篇 |
2015年 | 649篇 |
2014年 | 960篇 |
2013年 | 6604篇 |
2012年 | 929篇 |
2011年 | 964篇 |
2010年 | 754篇 |
2009年 | 718篇 |
2008年 | 807篇 |
2007年 | 739篇 |
2006年 | 682篇 |
2005年 | 624篇 |
2004年 | 591篇 |
2003年 | 561篇 |
2002年 | 528篇 |
2001年 | 876篇 |
2000年 | 635篇 |
1999年 | 571篇 |
1998年 | 324篇 |
1997年 | 366篇 |
1996年 | 368篇 |
1995年 | 349篇 |
1994年 | 313篇 |
1993年 | 302篇 |
1992年 | 464篇 |
1991年 | 459篇 |
1990年 | 463篇 |
1989年 | 464篇 |
1988年 | 398篇 |
1987年 | 437篇 |
1986年 | 418篇 |
1985年 | 475篇 |
1984年 | 381篇 |
1983年 | 341篇 |
1982年 | 303篇 |
1981年 | 270篇 |
1980年 | 227篇 |
1979年 | 372篇 |
1978年 | 279篇 |
1977年 | 245篇 |
1976年 | 207篇 |
1975年 | 233篇 |
1974年 | 219篇 |
1973年 | 202篇 |
排序方式: 共有10000条查询结果,搜索用时 468 毫秒
991.
992.
993.
994.
C. Hellingman 《International Journal of Science Education》2013,35(1):29-43
Summaries English Teaching science nowadays includes more teaching of experimental methods than it formerly did, and this trend may well continue. Teaching experimental methods means teaching how to solve problems in an experimental way, which is quite different from teaching the laws and facts of science. The need for a list of practical objectives has existed in the past and will be felt, more and more, in the future. An attempt to construct new lists for the three sciences was made by staff members of CITO, the Dutch Institute for Educational Measurement, specially, though not only, for the purpose of assessment. Intended characteristics of the lists are exhaustiveness; restriction to cognitive and psycho‐motor skills and abilities; formulation in terms of observable pupil behaviour; specification up to four levels; and identity for physics and chemistry up to three levels. 相似文献
995.
996.
Jürgen Altmann 《Ethics and Information Technology》2013,15(2):137-152
Arming uninhabited vehicles (UVs) is an increasing trend. Widespread deployment can bring dangers for arms-control agreements and international humanitarian law (IHL). Armed UVs can destabilise the situation between potential opponents. Smaller systems can be used for terrorism. Using a systematic definition existing international regulation of armed UVs in the fields of arms control, export control and transparency measures is reviewed; these partly include armed UVs, but leave large gaps. For preventive arms control a general prohibition of armed UVs would be best. If that is unattainable, several measures should be taken. An explicit prohibition of autonomous attack, that is without a human decision, should be added to IHL. Concerning armed UVs remotely controlled by a human soldier, recommendations differ according to type or mission. New kinds of uninhabited nuclear-weapon carriers should be banned. Space weapons should be prohibited in general. UVs smaller than 0.2–0.5 m should be banned. Bigger remotely controlled armed UVs not equipped with weapons of mass destruction should be subject to numerical limitations in various categories. For these the Treaty on Conventional Armed Forces in Europe is an important precedent. 相似文献
997.
A Hunter College librarian, with public library experience, offered a series of drop-in workshops Saturday afternoons open to all students and questions regarding Web or Windows use in the academic year, 2000-2001. The intention of the workshops was to address the continuous needs of students lacking technological and informational literacy. The success of these workshops led to this investigation of the implications of 21st century technology on non-traditional students from the perspective of bibliographic instruction as well as reference desk service. The perspective is that of the urban educational environment of City University of New York and Hunter College. The histories of open admissions at CUNY and the current efforts to abolish remediation are examined. 相似文献
998.
David Nicholas Hamid R. Jamali M. Paul Huntington Ian Rowlands 《Learned Publishing》2005,18(3):212-220
This paper presents the results of a major investigation by questionnaire of author attitudes towards scholarly publishing, which was funded by the Publisher's Association. Altogether, the views of nearly 4,000 authors were obtained and this paper concerns just those thousand or so authors who accepted the invitation to write freely about their own personal feelings and experiences. Using QSR N6 textual analysis software, their comments were processed and themes extracted. While the rest of the questionnaire, which was formed of closed‐question, tick‐box type questions, clearly must have had some impact on their thinking, the authors had considerable latitude in regard to what they could say. The paper provides a unique opportunity to hear their views directly. The pressing topics turned out to be (in rough order of concern): the peer‐review system, copyright, journal prices, alternative business models for journal publishing, big deals, Elsevier, electronic publishing and digital journals. 相似文献
999.
The paper is devoted to the problem of the qualitative training of management specialists. New methods and instruments permitting the quality of accepted decisions to be heightened are described. It is suggested to use an SISDM containing the functions of the system as an instrument for planning decisions and training in decision making with the use of computerized methods for the active teaching of the method for the analysis of concrete situations and management games. 相似文献
1000.
N. M. Builova V. S. Egorov O. V. Kirillova L. M. Koroleva T. A. Pronina N. S. Soloshenko 《Scientific and Technical Information Processing》2007,34(6):301-304
The pilot issue of the data collection of the All-Russian Institute of Scientific and Technical Information of the Russian Academy of Sciences “Industry of Nanosystems and Nanomaterials” gives an approximate view of the state of this field of science at the beginning of 2007. The topics of articles in the pilot issue are analyzed. The directions of development of nanotechnologies are shown. The basic types of nanomaterials, the methods of their production, and their properties and applications are given. 相似文献