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61.
离心机主轴形位公差选择标注及检测 总被引:2,自引:2,他引:0
介绍了碟式离心机的结构,分析了其传递动力和转动的零件—主轴的功用,选择标注了主轴的形位公差值并提出了单件生产中各项形位误差的现场检测方法。 相似文献
62.
粮油检验的气相色谱法中微量注射器的使用方法 总被引:1,自引:0,他引:1
随着气相色谱在粮油检验中应用越来越广泛,要求操作才规范、熟练、正确地使用微量注射器,结合实际工作需要,叙述了微量注射器的使用方法以及保养和维修经验。 相似文献
63.
64.
近景摄影测量是一种不接触物体而精确地测量物体的空间坐标及绘图的新型测量方法。本文简述了近景摄影测量的基本原理,通过对汽车模型外壳的近最摄影测量试验,绘制出汽车车身外形图和解算出模型点的空间坐标,其精度可达±0.302mm。研究表明,在汽车外型设计和品质检测中采用这种方法是行之有效的。 相似文献
65.
H. Korkeala T. Alanko O. Mtiki-Pettiys O. Sorvettula 《Acta veterinaria Scandinavica》1988,29(1):15-22
The effect of the pH on the boiling test was studied in 68 beef and 108 pork muscles. The pH had a significant effect on the sensory scores obtained from the boiling test. The effect was particularly pronounced in the odour of meat. In beef the odour scores remain steady for samples with a pH value under about 6.2 and start to increase rapidly in higher pH values. In pork the increase in scores appears to be linear. The odour observed in high pH meat was described by the judges as abnormal and ammonialike. In the case of meat with a high pH, the results of the boiling test at meat inspection should be interpreted with extreme caution. 相似文献
66.
The study was carried out from July 2007 to June 2008 in Wolaita Sodo Abattoir to assess the status of hydatidosis in cattle.
Routine meat inspection, hydatid cyst count and characterization were conducted. Out of 400 cattle slaughtered in Wolaita
Sodo Abattoir 64 (16%) animals were found harboring hydatid cysts. Thorough meat inspection in the abattoir revealed that
74 visceral organ were found harboring one or more hydatid cysts. The infection of the lung, liver, spleen and kidney were
found to be 45.94% 45.94%, 6.75% and 1.35% respectively. From the total of 283 hydatid cysts counted 153(54.06%), 17(6.00%),
5(1.76%), 108(38.16%) were found to be small, medium, large and calcified cysts respectively and 170(60.28%), 5(1.76%) and
108(38.16%) were sterile, fertile and calcified cysts respectively. The rate of cyst calcification was higher in the liver
than in the lung while fertility rate was higher among the cysts of the lung. Hydatid cyst viability rate of 40% was observed. 相似文献
67.
68.
The liability United States (U.S.) tree owners face from hazardous trees on their private properties has and continues to undergo a transformation. The traditional common law legal test focused upon whether a tree owner had acted to create a hazardous condition on the property. The modern trend is towards a test that imposes greater responsibility and greater uncertainty on tree owners and arborists. Abandoning the natural/artificial distinction, the modern test, adopted in half the U.S. jurisdictions, imposes general principles of negligence on tree owners. This paper discusses the U.S. legal context for hazardous trees, particularly the impacts on individual tree owners. It closes by addressing various practical means to minimize the risks associated with the modern legal standards, both for susceptible tree owners, and for professionals assessing the subject property. 相似文献
69.
A Slaughter Slab Survey for Extra-Intestinal Porcine Helminth Infections in Northern Tanzania 总被引:1,自引:1,他引:0
Ngowi HA Kassuku AA Maeda GE Boa ME Willingham AL 《Tropical animal health and production》2004,36(4):335-340
A survey on extra-intestinal porcine helminths was conducted at three slaughter slabs that receive pigs from Mbulu, a district endemic for porcine cysticercosis in northern Tanzania. Seventy carcases of pigs between 1 and 2 years old were examined between December 1997 and March 1998. The examination involved ante-mortem lingual examination for Taenia solium cysticercosis followed by post-mortem inspection. In addition, a laboratory procedure was performed to determine whether any of these domestic pigs were infected with Trichinella species. Parasites detected were Ascaris suum (44.3%), Echinococcus granulosus (4.3%) and Taenia hydatigena (1.4%). The lack of cases of porcine cysticercosis in this study compared to previous studies suggests that pig traders are conducting their own ante-mortem lingual examinations before purchasing pigs in the rural communities where the parasite is still highly prevalent. It is concluded that improved meat inspection could prove useful in reducing the local population's risk of infection with these parasites. The results of this study have revealed the parasites of agricultral and public health importance in the targeted communities. Further epidemiological investigations are required to better determine parasite prevalence and impact in order to formulate appropriate and cost-effective strategies for control. 相似文献
70.
K. Forde A. Hillberg-Seitzinger D. Dargatz N. Wineland 《Preventive veterinary medicine》1998,37(1-4):209-217
Knowledge about the patterns of animal movement – particularly feeder-cattle movement – within the USA is necessary in order to anticipate how diseases might be spread geographically. This study was conducted to explore the availability of interstate-level movement data which might be used to develop a more coherent national picture of interstate feeder-cattle movement. State Statistical Offices of the National Agricultural Statistics Service, 1996 (NASS) and Departments of Agriculture in all 50 states were contacted to determine the type of information collected regarding the import and export of feeder cattle. Eighteen of the 50 states contacted recorded updated import and export information by using certificates of veterinary inspection and (occasionally) entry permits for verification. The 18 states were: Alabama, Colorado, Florida, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Maryland, Massachusetts, Minnesota, New Jersey, Pennsylvania, Texas, West Virginia, Wisconsin, and Wyoming. Profiles of import and export data from Kansas, Texas, Colorado and Iowa (the primary receivers of 51% of total 1995 imports) were developed. These four states received at least 50% of their cattle imports from <9 different states. As a result, approximately half of the nation's import movement can be explained by a total of 13 states and Mexico (excluding duplicates). Also, >50% of the exports from Kansas, Texas, Colorado, and Iowa go to ≤3 states. This import and export information confirms conclusions of others that cattle tend to move toward the center of the USA. However, if more states kept comprehensive, up-to-date records of movement information, knowledge about cattle-movement patterns in the USA would be importantly increased. The lack of specific notations on certificates of veterinary inspection can lead only to perceived trends; the present records have limited value in tracking animal movement. 相似文献