共查询到20条相似文献，搜索用时 78 毫秒
1.
山莓为多年生直立灌术，根、茎、叶、果均可入药，尤其是果实味道甜美、营养丰富，是食用价值很高的野生水果和制作果汁、果酱、提取SOD的上等原料。山莓在我国分布极广，适应能力强，很适合引种驯化，山莓叶片生长好坏是影响其产量和品质的重要园子，其叶面积系数可反映它的生长状况和动态变化，是衡量群体结构是否合理的一个重要指标．本以我们引种栽培的山莓为材料，推出了计算其叶面积及叶面积系数的公式，以供研究参考． 相似文献
2.
山莓（RubusCorchorifoliusL.f.）为多年生直立灌木，根、茎、叶、果均可入药，尤其是果实味道甜美、营养丰富[1]，是食用价值很高的野生水果和制作果汁、果酱、提取SOD的上等原料[2,3]．山莓在我国分布极广，适应能力强，很适合引种驯化．山莓叶片生长好坏是影响其产量和品质的重要因子，其叶面积系数可反映它的生长状况和动态变化，是衡量群体结构是否合理的一个重要指标．本文以我们引种栽培的山莓为材料，推出了计算其叶面积及叶面积系数的公式，以供研究者参考．1山事时面积的测定测定山萄叶片的最大长（a）和最大宽（），计算长方… 相似文献
3.
野生植物资源——野地瓜的开发利用研究 总被引：2，自引：1，他引：1
通过对贵州省内野生植物资源--野地瓜的资源调查,并对其进行引种驯化及其野生果实的营养成分测定,结果表明,野地瓜驯化是很容易成活的,果实的营养成分含量比较丰富,初步提出野地瓜具有开发价值的建议. 相似文献
4.
5.
池州市喀斯特山区生态脆弱性表现为基岩性、界面性、波动性等特点。喀斯特山区的生态恢复要从提高喀斯特山区的土地承载力、消除或减缓过重的人口压力的角度入手，通过保持水土，高效合理利用喀斯特山区水土资源，来解决基本生存问题；加强生态修复，重点发展以生态经济型林、茶、果、药等业为主的喀斯特山区植被恢复；培植替代产业，实行产业化经营；推广“新中模式”。 相似文献
6.
长顺县是国家级少数民族贫困县之一,属典型的传统农业县。该县的石漠化面积约占全县总面积的80％,已成为制约和束缚该县现代农业发展的最大障碍。针对喀斯特山区的特点,提出了促进喀斯特山区现代农业发展的途径。 相似文献
7.
石漠化是西部生态建设中面临的最为突出的地域环境问题,也是制约喀斯特山区经济可持续发展的主要障碍之一.文章通过全面分析石漠化形成的自然因素和人为原因,以及广西喀斯特山区目前石漠化的时空分布特征,结合当地可用于改善石漠化过程的有利条件,提出了防止石漠化的综合治理措施. 相似文献
8.
9.
10.
11.
罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
12.
Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
13.
邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
14.
Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
15.
16.
17.
《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
18.
陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
19.
Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
20.
YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献