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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。
- I have to buy a more economical stove. 我得买一个更节省燃料的火炉。
- The cabin has a flat stone for a threshold. 这间小屋用一条扁平的石头做门槛。
- The treaty will be the threshold of lasting peace. 这个条约将成为持久和平的开端。
- He was on the threshold of his career. 他的事业刚刚起步。
- She is economical in her use of salt when cooking. 她烹饪时用盐很少。
- This is not an economical method of heating. 这不是一种经济的取暖方式。
- He had never crossed the threshold of a bar before. 他过去从未进过酒吧的门。
- She writes novels with economical style. 她以简练的风格写小说。
- Scientists are now on the threshold of an important discovery. 科学家们很快就会有一项重大发现。
- A monthly is more economical than 4 weeklies. 一张月票比四张周票上算。
- It's not an economical method of heating. 这不是一种经济的取暖方式。
- The explosion of oil prices caused an economical crisis. 石油价格的急剧上涨引起了经济危机。
- The tax threshold for a single pensioner is 450 dollars. 单身养老金领取者的征税起点是450美元。
- Diesel is the more economical in fuel on a pound per horse power basis. 以一磅对一马力的比率而言,柴油式在燃料上是比较经济的。