共查询到20条相似文献，搜索用时 15 毫秒
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骨骼系统由中轴骨骼（包括头骨、脊柱、肋骨和胸骨）和附肢骨骼（包括带骨和游离肢骨）组成,它具支持躯体和保护内脏器官的作用,还是肌肉的附着点,是人的运动器官。在生存斗争的进化过程中,人类的骨骼产生了与直立行走相适应的特征。一、中轴骨骼与直立行走相适应的特征1．头骨头骨包括脑颅骨与面颅骨,最初的功能是保护脑和头部感官,组成结构十分复杂,在进化的过程中由于与特定生活条件和生活方式的适应,人类的头骨发生了剧烈变化。人的脑颅骨,因脑的高度发育,在既能起到保护作用的同时尽可能的变薄,以利于脑颅腔容积的增大。大… 相似文献
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《课堂内外(小学版)》2004,(4)
奇特的外观变色龙的头和身体有些扁,皮肤被覆颗粒状鳞。四肢很长,前后肢的五指(趾)分为相对的两组,前肢的内侧三指合在一起,外侧的二指合在一起,相互对称;后肢则与前肢的情况相反。它们的尾也很长,通常呈卷曲状。因有善于攀援树干的脚掌和尾巴,所以攀爬和抓握树枝的能力很强。 相似文献
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平胸总目不会飞翔善奔走,龙骨突起不具有;后肢发达翼退化,无尾综骨羽小钩;雄鸟具有交配器,常见鸵鸟产南球。２企胸总目不会飞翔游迅速,胸骨发达龙骨突;羽毛似鳞后肢短,前肢鳞状足有蹼;代表动物有企鹅,主要分布南极陆。３突胸总目善于飞翔为多数,胸骨发达龙骨突;锁骨“Ｖ”形胸椎合,肋骨上有钩状突;正羽完整翼发达,具综荐骨气性骨;雄鸟少见交配器;种类繁多广分布。４鸣禽类足为离趾型,鸣肌发达且善鸣;常见雀形目,体型小巧又玲珑。（１）雀形目小巧玲珑种数多,鸣肌发达“爱唱歌”;三趾向前一趾后,脚较细短树上… 相似文献
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文章的主题如人之“灵魂”,文章的材料如人之“血肉”,而文章的结构恰似人之“骨骼”。失去坚实、分布科学的骨骼,血肉就无所依附,灵魂也无所寄托,由此可见健全“骨骼”的重要。中考作文评分标准一般由内容、语言和结构三大块组成。结构又可以分为4～5个等次,其间的差别主要表现在：1．文章是否完整;2．详略是否得当;3．层次、线索是否清晰;4．照应是否紧密;5．过渡是否自然;6．行文是否曲折。 相似文献
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真假制约关系问题是逻辑学界研究的热点问题.包含两个自变元的联言命题与相容选言命题、充分条件假言命题、必要条件假言命题,通过前肢互否、后肢互否、双肢互否和非双肢互否等方式形成的各个命题之间,仍具有真假制约关系,可在此基础上建立立体逻辑方阵. 相似文献
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In this work we present a probabilistic learning approach to model video news story for retrospective event detection (RED). In this approach, both content and time information on a news video is utilized to transcribe the news story into terms, which are divided into classes by their semantics. Then a probabilistic model, composed of sub-models corresponding to the semantic classes respectively, is proposed. The model’s parameters are estimated by EM algorithm. Experiments showed that the proposed approach has better detection resolution. 相似文献
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Candido Alberto Gomes 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》1999,45(1):45-63
Despite its importance in relation to social mobility, secondary education is characterised by an unequal distribution of knowledge among different groups of students, and a hierarchy in which some types of knowledge are valued more than others. In comparing secondary education in different countries, two main systems are apparent: "sponsored mobility" and "competitive mobility". In the former, students are divided into different groups according to ability at an early stage in their schooling. In the latter, the selection process is postponed until the final phase. Brazil, in its recent history, has moved from sponsored mobility to competitive mobility. The author explores some of the lessons during this process and examines their implications for the future. 相似文献
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苦碟子注射液治疗2型糖尿病下肢血管病变的临床观察 总被引：3，自引：0，他引：3
王晓青 《安阳师范学院学报》2006,(5):153-154
目的:观察苦碟子注射液治疗2型糖尿病下肢血管病变的临床变化。方法:将60例2型糖尿病下肢血管病变的病人随机分为治疗组、对照组,治疗组给予常规治疗并且以苦碟子注射液40mL加液静滴,每日一次;对照组给予常规治疗。观察:四周后观察两组病人下肢血管病变的恢复情况。结果治疗组病变恢复情况总有效率明显优于对照组(p<0.05)。结论:苦碟子注射液对2型糖尿病下肢血管病变有明显的治疗作用。 相似文献
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目的:利用局解废弃材料快速制作骨质好,结构完整,数目成套齐全的足骨标本。方法:将取下的足标本放入32mm高压锅内加清水没至标本25mm水位,盖好锅盖并放上限压阀,放置2500w电炉上通电加热,待限压阀排气后,继续蒸煮15min。随后将上述处理好的足骨按套(每套分别用1个小铁丝篓)放入CS101-3型电热鼓风干燥箱内(温度调至110℃)进行烘烤,在温度达到110℃时,继续烘烤15min即可切断电源,将足骨倒入加有洗衣粉50℃温度热水中浸泡,搓洗10min,用同样方法进行两次处理即可。结果:按传统方法用有机溶剂浸泡脱脂处理,时间需1-2个月,而经电热鼓风干燥箱烘烤处理过的足骨进行有机溶剂浸泡脱脂处理,可缩短2/3时间。结论:该方法改进之处在于,将足骨在脱脂之前经过了电热鼓风干燥箱多次烘烤处理,使骨髓腔内的脂肪大部分逐被蒸发去除,缩短了标本的脱脂时间,也解决了标本处理阶段需晾晒等问题。 相似文献
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刘涛 《五邑大学学报(社会科学版)》2008,10(1):42-46
综观清世以降的南朝散文研究演进历程,大致可划分为三个时期：初创期（清代至1949年）、发展期（1949至1990年）、开拓期（90年代至今）。清世以降的南朝散文研究成果丰硕,但相较于诗、赋研究,力度仍然不够。 相似文献
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根据电场能促进骨细胞生长这一生物学特点,设计一种新型的既能填充骨缺损又能刺激骨细胞形成的仿生人工骨材料,从众多的压电陶瓷中选取BaTiO3、从活性生物材料中选取Ca3（PO4）2为主要原料,辅以助熔剂、成孔剂等添加剂,合成压电相与磷酸三钙复合型生物陶瓷人工骨（BTTCP）,确定合适的制备工艺,并用XRD、SEM、EPMA等现代测试手段对其组成、性能及微观结构的关系进行探讨和分析,为骨缺损的修复探索一条新途径. 相似文献
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Robin Shields 《Compare》2016,46(1):5-23
This paper examines international student mobility between member states of the European Higher Education Area (EHEA), a group of 47 countries that committed to reforming their higher education systems to improve the comparability and compatibility of degrees. While increased student mobility is a key goal in its official documents, little research has empirically investigated student mobility patterns in respect to the EHEA. The analysis employs multivariate techniques to identify trends in student mobility between 1999 and 2009, using a spatial approach to visualise the relationships between member states as constituted through student mobility flows. Results show that within the analysis timeframe student flows in the EHEA became more even in their distribution, but that in terms of the relationships between states, the EHEA became more centralised and segmented, meaning that key actors mediated exchanges between peripheral states and the region was more easily divided into self-contained clusters. These trends indicate a need to critically reconsider the nature of the EHEA and its role in the globalisation of higher education. 相似文献
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运动性骨折是运动中经常发生的伤病,中医认为运动性骨折的发病原因可以分为两类：一是外因;二是内因.辨明骨折发病原因对预防和治疗运动员的运动伤病具有重要的意义. 相似文献
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Hanno Steinke Toshiyuki Saito Gudrun Herrmann Takayoshi Miyaki Niels Hammer Mara Sandrock Masahiro Itoh Katharina Spanel‐Borowski 《Anatomical sciences education》2010,3(5):254-260
Gross dissection for demonstrating anatomy of the human pelvis has traditionally involved one of two approaches, each with advantages and disadvantages. Classic hemisection in the median plane through the pelvic ring transects the visceral organs but maintains two symmetric pelvic halves. An alternative paramedial transection compromises one side of the bony pelvis but leaves the internal organs intact. The authors propose a modified technique that combines advantages of both classical dissections. This novel approach involves dividing the pubic symphysis and sacrum in the median plane after shifting all internal organs to one side. The hemipelvis without internal organs is immediately available for further dissection of the lower limb. The hemipelvis with intact internal organs is ideal for showing the complex spatial relationships of the pelvic organs and vessels relative to the intact pelvic floor. Anat Sci Educ 3:254–260, 2010. © 2010 American Association of Anatomists. 相似文献
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廖信裴 《重庆第二师范学院学报》2008,21(1)
《红楼梦》的结构从描写对象看,分虚、实两大板块,即虚幻世界与现实世界;从情节发展看,分虚线与实线两大线索。实线又由主线、副线交织构成。主线写贾氏家庭兴衰荣辱的演变过程;副线写贾宝玉与林黛玉的爱情的婚姻悲剧以及大观园中诸女子的理想、追求和各自不同的人生命运。 相似文献