The larvae prey upon small aphids.这种幼虫以小蚜虫为食。Heavy rain or hail may dislodge many aphids from the plants.大雨和冰雹可从植株上击落很多蚜虫.She pinched the aphids off the rose.她从玫瑰(花)上抓走蚜虫....
...pests like aphids which infest cereal crops.像蚜虫这样大肆侵害谷物的害虫Bunchy top disease can spread from plant to plant and it is also spread by aphids.束顶病可以通过个体间传播,也可以通过蚜虫传播.Heavy rain or hail may dislodge many aphids from the p...
In this paper , the fractal theory of floc structure is briefly addressed.絮体结构和强度特征是絮凝过程的重要参数.Floc concentration distribution in a dynamic flocculator with a flat vane wheel was measured experimentally.实验测定了平直叶轮动态混合絮凝器内絮...
蒸汽和水力可用来发电.Steam and water power are used for the generation of electricity.在19世纪人们大规模使用水力来发电.In the 19 th century waterpower was widely utilized to generate electricity.这里正筹划建设一座水力发电站.Plans are being drawn up to build a...
The preparation of catalysts , yield of glyceryl triacetate and and demerits the catalysts were introduced briefly.对上述催化剂制备、三醋酸甘油酯收率、催化剂优缺点作简要介绍.This paper analyzes the glyceryl polyether by nuclear magnetic resonance ( ...