【摘 要】
：
截至目前,我国各省(区、市)今年已完成美国白蛾防治计划任务的40%。其中,辽宁省因美国白蛾的发生期较晚,目前尚处于防治准备阶段。与往年相比,今年各地防治呈现动手早、飞防
论文部分内容阅读
截至目前,我国各省(区、市)今年已完成美国白蛾防治计划任务的40%。其中,辽宁省因美国白蛾的发生期较晚,目前尚处于防治准备阶段。与往年相比,今年各地防治呈现动手早、飞防比重加大、防治物资投入增加、未发生省未雨绸缪等新的特点。
Up to now, all provinces (autonomous regions and municipalities) in China have completed 40% of the task of the control plan for the white moth in the United States this year. Among them, Liaoning Province due to the late occurrence of the United States white moth, is still in the preparation stage of prevention and control. Compared with the previous years, prevention and control throughout the year showed an early start, increasing the proportion of both defense and defense, increasing investment in prevention and control of materials, and taking no precaution in the province.
其他文献
目的了解某高校社区人群对校医院高血压专项服务的使用情况和被服务意愿,为有针对性地提高高血压服务质量提供依据。方法利用医院信息系统(HIS)和自行设计问卷,对首都医科大
Ultrafast optoelectronic technology has been widely used in terahertz time domain spectrum,terahertz imaging technology,terahertz communication and so on,and gr
An optically controlled SiC/SiCGe lateral power transistor based on superjunction structure has been proposed, in which n-SiCGe/p-SiC superjunction structure is
场效应管好坏的判断与晶体三极管不同:第一步,先将三个管脚短路,用万用表1kΩ档黑表笔接D(漏)极,红表笔接S(源)极,测得电阻应
Good or bad field transistor judge and tran
多年的高等职业院校教学,感觉学生主动学习的越来越少,被动学习甚至不学习的越来越多。要提高高职教育的教学质量,如何促使高职学生成为学习的主体至关重要。
Years of teac
Model order reduction of interconnect circuits is an important technique to reduce the circuit complexity and improve the efficiency of post-layout verification
The conventional circuit model of a bit-stream adder based on sigma delta(∑Δ) modulation is improved with pipeline technology to make it work correctly at hig
提出一种基于长周期波导光栅的宽带集成Er-Yb掺杂磷酸盐玻璃集成波导放大器,其中增益平坦光栅滤波器直接刻蚀在有源波导上。放大器模型建立在考虑了上转换之后的传输与速率方
在收集资料基础上,笔者在北京市不同地区选择一些有代表性的地段进行标准地调查。调查时间段为2007年7月～2009年9月,在调查过程中,使用罗盘仪、标杆、测绳等设置面积为600平方
研究了不同时期及剪截方式对二球悬铃木嫩枝扦插成活的影响.结果表明,不同时期对插穗成活率,伸长量,叶片数,平均根数,平均根长的影响差异极显著;而不同剪截方式对插穗成活率,