【摘 要】
：
为了加快首都绿化的进程,完成今后绿化650万亩荒山的任务。提出以下两点建议. 一、选用优质壮苗: 实践证明,苗干通直、粗壮,苗木无病虫害、侧根发达的具有旺盛的生活力,对逆
论文部分内容阅读
为了加快首都绿化的进程,完成今后绿化650万亩荒山的任务。提出以下两点建议. 一、选用优质壮苗: 实践证明,苗干通直、粗壮,苗木无病虫害、侧根发达的具有旺盛的生活力,对逆境条件的适应性和再生能力强,根系也较发达,所以造林成活率高,幼林生长快。
In order to accelerate the process of greening the capital, the task of greening 650 million mu of barren hills in the future will be completed. Proposed the following two suggestions: First, the selection of high quality seedlings: Practice has proved that seedlings stems straight, sturdy, seedlings no pests and diseases, developed lateral root with strong vitality, adaptability to adverse conditions and regeneration ability, root system is also more Developed, so afforestation survival rate is high, young forest grows fast.
其他文献
眶内壁骨折在临床上较多见,但严重的眶内壁骨折合并眼球陷入筛窦的病例却极为罕见,笔者于2004年收治1例,现报告如下。患者男性,67岁,于2004年4月因被小牛9伤左眼1h而就诊。受
请下载后查看，本文暂不支持在线获取查看简介。
Please download to view, this article does not support online access to view profile.
Purpose: To investigate the expression of thrombospondin 1 (TSP-1) in retinal pigment epithelium (RPE) and choroidal neovascular membranes (CNVMs) from patients
Since Canada made the first anti-dumping code in 1904, United States, Australia and France made their domestic anti-dumping codes suc- cessively. In 1947, the c
Based on data observed from 1989 to 1998 in the Ziwuling survey station, changes of soil erosion and soil physico-mechanical properties were studied aft
9月的香港,胶着已久的“特首参选人”有突破性进展。本来表明考虑参选特首的全国人大常委范徐丽泰,9月8日突然改变口风。唐英年阵营则透露消
In September Hong Kong, a sta
Electrochemical reduction of dissolved oxygen in seawater on metals is of great importance for corrosion studies.The present paper studied cathodic reduction of
由国家体育总局、中华全国体育总会、中国奥林匹克委员会、中国体育用品业联合会、中国体育科学学会主办,国家体育总局体育器材装备中心、华兴体育用品发展中心承办的2010(第
因为世界杯,这个六月除了足球难有别的主题。我们借此机会赶下时髦,聊聊高尔夫与足球的话题。在世界足坛,我们熟知的“球王”马拉多纳、“足球皇帝”贝肯鲍尔、“万人迷”贝
词汇是初中英语学习的基础，无论是口语表达还是听力、阅读和写作，都需要学生掌握大量的词汇。在初中英语学习阶段，词汇量比小学阶段增加许多，一时间学生感觉到压力很大，记忆单词的效率也非常低下，这一定程度上限制了学生英语水平的提高。本文中，笔者结合自身多年的教学经验，在调查研究的基础上，总结了一些单词记忆的方法，希望能对初中生英语词汇的学习起到一定的积极影响。 一、以理解记忆代替机械记忆 人类的记忆力