【摘 要】
：
美国白蛾是林业生产的最重要检疫害虫,白蛾周氏啮小蜂是美国白蛾的重要天敌,它是将野生白蛾周氏啮小蜂接种到柞蚕蛹体内人工培育而成,在美国白蛾五令期,释放林间,从而达到以
论文部分内容阅读
美国白蛾是林业生产的最重要检疫害虫,白蛾周氏啮小蜂是美国白蛾的重要天敌,它是将野生白蛾周氏啮小蜂接种到柞蚕蛹体内人工培育而成,在美国白蛾五令期,释放林间,从而达到以虫治虫的目的。利用它,不仅防治成本低,操作方便,而且对防止农药污染,维持生态平衡,实现生物防治和可持续发展具有重要意义。大连市庄河仙人洞镇付店委冰峪蚕茧经销部位于大连以北180公里,
The American white moth is the most important quarantine pest in forestry production. The white moth, Zhou squid wasp is an important natural enemy of the American white moth. It is the artificial breeding of the wild white moth, White moth five orders, the release of forest, so as to achieve pest control purposes. The use of it not only has the advantages of low prevention and control cost, convenient operation, but also great significance for preventing pesticide pollution, maintaining ecological balance, achieving biological control and sustainable development. Zhuanghe immortal hole in Dalian City to pay the shop Bingyu cocoon Bingyu Distribution Department is located 180 kilometers north of Dalian,
其他文献
A series of GaN layers was grown on sapphire (0001) substrates under various growth conditions by means of the molecular beam epitaxy(MBE) method, the optical c
￥安凯汽车集团＠牛家忠＠吴向阳＠董刚斯达—斯太尔９１系列汽车车轮制动器采用Ｓ形凸轮鼓式制动方式、领从蹄式结构。该制动器结构简单，使用维修方便，是重型汽车中较为常用的结构。本文将对
《义务教育语文课程标准》强调：“小学生写作文就是记录他们的所见所闻所感以及他们的想象。”教学小学作文时重点应该放在拓展学生的写作思路上，要让他们把自己想的、看到的真人真事描述出来，表达自己真实的情感，保证他们能够自由表达并且爱上表达。这就要求教师把写作教学和生活紧紧相连，树立起“生活本源”的教学理念，从而让作文成为学生生活的美丽牧场。 一、引导学生积累生活素材 （一）在劳动实践中积累习作素材
The hydroaminomethylation of 1-dodecene catalyzed by water soluble rhodium complex RhCl(CO)(TPPTS)2 in the presence of surfactant CTAB was investigated. High r
上学时无论如何也想不到自己会到统计局工作,那时一门心思地就想着毕业后如何做一名优秀的财会人员———毕竟是学了整整四年的财务会计。但命运却与我的想法相去甚远,毕业后
Agriculture is always a key issue to be addressed by China’s government. Thefarmers’ proportion is the biggest one in the country, in spite of the in-creased
大学声乐教学作为我国大学音乐教育中的重要组成部分,对我国高校学生的综合素质培养有着积极意义。近年来,随着教育制度的不断改革,各大高校对大学生的教学方式也进行了改革
何谓“晋乐”?我们把“晋乐”一词拆开来理解,“音”为声音, “乐”为文化,音乐是声音的艺术,是声音的文化艺术.先“音”再“乐”,因此追求优美的声音是我们训练过程中的首要
With impacts from relatively high temperatureand moderate soil humidity,there is frequentincidence of stripe rust,powdery mildewand underground pests during th