【摘 要】
：
一、植保专业化防治具有重要的现实意义1.建立病虫害专业化防治体系,实行植保专业化防治是适应病虫害发生防治自然规律的必然要求。在相对一致的农业生态条件下农业有害生物
论文部分内容阅读
一、植保专业化防治具有重要的现实意义1.建立病虫害专业化防治体系,实行植保专业化防治是适应病虫害发生防治自然规律的必然要求。在相对一致的农业生态条件下农业有害生物的发生具有相似性,在防治上必然要求进行相对
First, the special protection of plant protection has important practical significance 1. To establish a special pest control system, the implementation of special protection of plant protection is to adapt to the natural law of occurrence and control of pests and diseases a necessary requirement. Under the relatively same agro-ecological conditions, the occurrence of agricultural pests has similarities, so it is necessary to make the relative control
其他文献
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.
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.
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.
早就宣布了的为徕卡R8和R9相机准备的数码后背终于在不久前的Photokina 2004展会上与世人见面。笔者有幸拿到一台样机,于是迫不及待地开始了与它的首次接触
The already ann
A novel antimicrobial short peptide was purified from earthworm (Eisenia foetida) by a five-step protocol including ammonium sulfate precipitation, ultrafiltra
普瑞麦除草剂是美国陶氏公司近年研究,并己在我国示范、推广的一种高效、低毒麦田除草剂,具有杀草彻底、不易复发、药效稳定、对当茬和后茬作物均较安全等优点。经在江苏、山
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.
妈妈:Don’t talk with your mouth full.It doesn’t look clean.孩子:I just want to say something.妈妈:You can talk after you swallow your food.Nice manners at the
兴趣是学生学习的第一动力。英语教学中教师要善于激发学生学习的浓厚兴趣,让他们心中自然升起学习的欲望,从而全身心投入到学习中。小学英语传统的教学模式偏向应试教育,学