全文获取类型
收费全文 | 4351篇 |
免费 | 332篇 |
国内免费 | 194篇 |
出版年
2023年 | 66篇 |
2022年 | 61篇 |
2021年 | 72篇 |
2020年 | 103篇 |
2019年 | 155篇 |
2018年 | 154篇 |
2017年 | 158篇 |
2016年 | 162篇 |
2015年 | 153篇 |
2014年 | 195篇 |
2013年 | 324篇 |
2012年 | 171篇 |
2011年 | 191篇 |
2010年 | 146篇 |
2009年 | 231篇 |
2008年 | 246篇 |
2007年 | 236篇 |
2006年 | 250篇 |
2005年 | 170篇 |
2004年 | 164篇 |
2003年 | 153篇 |
2002年 | 144篇 |
2001年 | 94篇 |
2000年 | 81篇 |
1999年 | 91篇 |
1998年 | 81篇 |
1997年 | 71篇 |
1996年 | 55篇 |
1995年 | 64篇 |
1994年 | 47篇 |
1993年 | 66篇 |
1992年 | 58篇 |
1991年 | 48篇 |
1990年 | 45篇 |
1989年 | 32篇 |
1988年 | 29篇 |
1987年 | 25篇 |
1986年 | 21篇 |
1985年 | 25篇 |
1984年 | 36篇 |
1983年 | 20篇 |
1982年 | 28篇 |
1981年 | 28篇 |
1980年 | 23篇 |
1979年 | 16篇 |
1978年 | 19篇 |
1977年 | 21篇 |
1976年 | 10篇 |
1974年 | 8篇 |
1973年 | 9篇 |
排序方式: 共有4877条查询结果,搜索用时 265 毫秒
211.
In January 1998, Taiwan promulgated the Law of the Republic of China (ROC) on the Territorial Sea and the Contiguous Zone and the Law of the Republic of China on the Exclusive Economic Zone (EEZ) and the Continental Shelf, both of which came into force on January 21, 1998. On June 26, 1998, China adopted the Law of the People's Republic of China on the Exclusive Economic Zone and the Continental Shelf, which is the most significant maritime legislation since its 1992 Law on the Territorial Sea and the Contiguous Zone. This article studies the recent maritime legislation developments in Mainland China and Taiwan, the differences and similarities between the two sets of laws, their implications for the Asia-Pacific region, and the potential challenges for the United States. 相似文献
212.
Yann-Huei Song 《Ocean Development & International Law》2013,44(2):150-177
This article examines the potential threat of marine pollution caused by offshore oil and gas development activities in the disputed areas of the South China Sea (SCS) and the Spratly Islands. After addressing the potential threat of marine pollution, it discusses the legal obligations and political commitment of the SCS littoral states regarding the protection of the marine environment in the area. The role that Taiwan can play in these matters is also examined. 相似文献
213.
Ramses Amer 《Ocean Development & International Law》2013,44(1):17-40
This article examines recent developments in the South China Sea; in particular, the China-Vietnam relationship. The developments are presented in the broader context of the Sino-Vietnamese approach to managing border disputes since full normalization of relations in late 1991. The challenges for China and Vietnam in managing their disputes and related tension in the South China Sea are also discussed. 相似文献
214.
Kevin W. Riddle 《Ocean Development & International Law》2013,44(3-4):265-297
Illegal, unreported, and unregulated (IUU) Fishing is considered a major threat to high seas fish stocks. Each of the the international regional fishery management organizations (RFMOs) are combating some form of IUU fishing and this led the Food and Agriculture Oranization of the United Nations (FAO) to adopt the International Plan of Action to Deter, Prevent and Eliminate IUU Fishing (IPOA-IUU). This article will analyze the issues involved with IUU fishing, examine the recommendations in the IPOA, and consider examples of successful management and enforcement measures in use by states and RFMOs. Finally, recent developments in China will be viewed as an example of how international cooperation is contagious. 相似文献
215.
In this study a new species of Neralsia is described, N. incompleta n. sp. The radial cell shape allows to distinguish it clearly from the rest of species of the genus. The distribution of Neralsia incompleta n. sp. is probably the entire American continent, having been collected from Canada to Paraguay. In spite of its abundance, the associated biology is unknown, although it should be related with parasitism of Diptera Cyclorrhapha. 相似文献
216.
Oldřich Šebesta 《法国昆虫学会纪事》2013,49(3):272-280
The presence of the thermophilic species Anopheles hyrcanus in the lower Dyje River basin has been regularly monitored since 2008. Mosquito trapping has been conducted mainly in summer using EVS traps with CO2 as attractant. Anopheles hyrcanus and Culex modestus were studied in a group of ponds near the Czech–Austrian border. At the Sedlec location, occurrence of An. hyrcanus was low during 2008–2011, with around 1–9 individuals/trap/collection day. At the Lednice location on the edge of Mlýnský Pond, the first capture of An. hyrcanus occurred in 2010. In 2013, there was a sudden increase in the An. hyrcanus mosquito at all monitored locations. The largest presence was recorded at Sedlec and reached 524.4 individuals/trap/collection day. Culex modestus was one of the predominant species throughout the period. At Sedlec, the smallest finding was in 2009 (at 9.6 individuals) while the greatest was in 2010 (at 988.6 individuals/trap/collection day). At Lednice, the smallest finding was in 2011 (at 56.3 individuals) while the largest was in 2013 (at 3850 individuals/trap/collection day). 相似文献
217.
218.
Donna F. Murdock 《Ethnos》2013,78(4):507-532
This article takes up the conundrum of conducting anthropological fieldwork with people who claim that they have ‘lost their culture,’ as is the case with Suau people in the Massim region of Papua New Guinea. But rather than claiming culture loss as a process of dispossession, Suau claim it as a consequence of their own attempts to engage with colonial interests. Suau appear to have responded to missionization and their close proximity to the colonial-era capital by jettisoning many of the practices characteristic of Massim societies, now identified as ‘kastom.’ The rejection of kastom in order to facilitate their relations with Europeans during colonialism, followed by the mourning for kastom after independence, both invite consideration of a kind of reflexivity that requires action based on the presumed perspective of another. 相似文献
219.
Stefano Benazzi Shara E. Bailey Francesco Mallegni 《American journal of physical anthropology》2013,152(2):300-305
The scarcity of Neandertal remains from Southern Europe hampers our understanding of Neandertal variability, and can bias interpretations about Neandertal geographic variation. To address this issue, it is often important to reassess human remains that, while discovered decades ago, remain relatively unknown to the scientific community. In this contribution, we provide a complete state‐of‐the‐art comparative morphometric analysis of Leuca I, an unworn left second upper molar (LM2) discovered in 1958 in Bambino's Cave (near Santa Maria di Leuca, Apulia, Italy) and attributed to Homo neanderthalensis. Our study includes comparisons of standard metric and nonmetric data, a 2D image analysis of the occlusal surface and measurements of both 2D and 3D enamel thickness and dental tissue proportions. Although Leuca I follows the Neandertal M2s trend in some morphometric aspects (i.e., small relative occlusal polygon area), in other cases it falls to the higher end (for 3D average enamel thickness) or even outside (for 3D‐relative enamel thickness) the Neandertal M2 variability, thus increasing the known Neandertal range of variation. Am J Phys Anthropol 152:300–305, 2013. © 2013 Wiley Periodicals, Inc. 相似文献
220.
Spore sculpture and wall structure of eight Cyathea (Cyatheaceae) species from southern South America were studied using light microscopy (LM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. Two layers, i.e. an inner and an outer layer, were observed in the perispore. The inner layer has two strata: the inner stratum is attached to the exospore and composed of rodlets tangentially oriented to the spore surface and randomly intermixed; the outer stratum consists of a three-dimensional network of rodlets with either free or fused distal edges forming spinules. The outer layer is thin, darkly contrasted and covers the rodlets. In most cases, the exospore has two layers and a pitted surface. In Cyathea atrovirens, the exospore surface is smooth, while in C. delgadii and C. myriotricha it is verrucate. The homogeneity of perispore features within the genus Cyathea is evident, while exospore features are heterogeneous. The exospore has different kinds of surface-structures that are of potential interest for assessing evolutionary trends within the group. 相似文献