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- The Economic threshold for the biological control of DBM was determined. 然后又确定了小菜蛾生物防治的防治目标;
- Studies on Yield Loss and Dynamic Economic Threshold of Cowpea Aphid Aphis craccivora Koch on Cowpea, Vigna sp. 豆蚜危害豇豆损失率及动态经济阈值研究。
- Simulation model of multivariate dynamic economic threshold of Asian corn borer. 亚洲玉米螟多元动态经济阈值模拟模型
- The experiment was conducted to estimate the economic injury level (EIL) and economic threshold (ET) of B. tabaci. 摘要研究了烟粉虱在黄瓜上的经济损害水平和经济阈值。
- The economic threshold of M.incognita was discussed, and the corresponding models were established. 本文还探讨了该病的经济阈值,幷组建了阈值模型。
- According to the present price of cowpea,the cost and effect of control,the economic threshold,for controlling of Liriomyza sativae was 30.35 worm-eaten path per leaf. 根据豇豆的价格、防治费用、防治效果等,算出其经济阈值为每片叶30.;35条虫道。
- Economic threshold models of timberlands pest management 用材林害虫管理经济阈值模式的研究
- He has been an unsung hero of the country's economic growth. 他是使这个国家经济成长的无名英雄。
- Mother works economic advantages accrue. 母亲工作时经济收入增加了。
- They had led the country into economic disaster. 他们把国家带入了经济灾难中。
- How Far the "Theory of Economic Threshold" of Yangtze River Delta would Go 长三角"经济门槛论"还能走多久
- A STUDY ON ECONOMIC THRESHOLD MODEL OF PHYLLOSTACHYS PUBESCENS ECOSYSTEM 毛竹林生态系统经济阈值模型的研究
- Do you know the economic policy of this year? 你知道今年的经济政策吗?
- Economic depression often follows war. 经济不景气常因战争所致。
- The country is in a bad economic state. 这个国家的经济情况很差。
- The lecture bore down on economic causes. 那次演讲着重论述经济方面的原因。
- Study on Apple Yield Loss and its Economic Threshold of Eriosoma lanigerum 苹果绵蚜为害苹果的产量损失及经济阈值研究
- The Study Progress of the Economic Threshold of Injurious Insect Control 害虫防治经济阈值研究进展
- The book will open up to readers new vistas on economic thinking. 这本书将为读者展现经济思想的新远景。
- They are faced with slippery economic problems. 他们面临棘手的经济问题。