在双减政策下,传统机械、重复的作业形式已经不适应时代发展的需要,也难以满足学生的学习需求.为此,初中物理教师要本着"以学生为本""一切从学生出发"的教育理念对物理作业设计进行改革与创新,提高学生完成作业的兴趣,满足学生多样化的学习需求,做到"减负不减责任,减负不减质量",用少而精的作业内容达到巩固知识、发展能力的目的,深入落实素质教育,更好地提升学生的物理核心素养.

tudents start to learn circuit-related knowledge from their middle school stage,but they have some learning obstacles in relevant problems,which will affect their further learning.This paper introduces two methods to lay a solid foundation for students with the method of combining words with diagrams.

This paper described five species of fruit flies from the northeastern Myanmar.These five species of fruit flies were Bactrocera(Bactrocera)thailandica Drew & Hancock,Bactrocera(B.) yoshimotoi(Hardy),Bactrocera(Zeugodacus) diaphora(Hendel),Bactrocera(Zeugodacus) vultus(Hardy) and Dacus(Callantra) longicornis Wiedemann.And characteristics of figure 12 of the five species of fruit flies are given.

It presents the transmitter research and development of indoor GPS(IGPS)measurement system,which is applied to adjustment-online of flexible assembly platform for large thin-walled parts assembly manufacture.This system consists of transmitter mechanical device,motor constant speed control and synchronization pulse device.The finite-element-analysis software NASTRAN is adopted to analyze the dynamic operation of the transmitter,and motion control card is applied to complete closed-loop control of motor rotation.Moreover,through testing performance of structure and the motor speed of the transmitter,the analysis results demonstrate that the designed system is able to avoid mechanical resonant and angular deviation,and promise its utility in three-dimensional large space measurement application.

Dendroctonus ponderosae Hopkins is one of the most important pests causing considerable economic losses of Pinus in America.Based on global distribution of D.ponderosae and global climate data,its potential suitable distribution in China was predicted by using BIOCLIM ecological niche modeling and ArcGIS.The results indicated that the optimum establishment areas were most areas of northern and northeastern China and parts of southwestern China.The predicted potential distribution of D.ponderosae in China was illustrated by ArcGIS.

In this paper,using Dehong frontier port 10 years monitoring data of fruit fly,analyzed the species,population dynamic and structure of the fruit fly.The results:(1) Monitoring identified 13 species of fruit fly in the 10 years,Bactrocera dorsalis,B.cucurbitae and B.tau are the largest populations.(2) The populations of 3 main types of fruit fly were increasing in past 10 years.The percentage was 28.1% in 2009,which was the highest percent in past 10 years.(3)To 2009,B.dorsalis has become the most dominant species in Dehong region.It accounted for three main fly in the absolute majority of 79.0%.Its fastest growing.

Dendroctonus frontalis Zimmermann is one of the most economically important pests of Pinus plantations in America.Based on the biology of D.frontalis and climate data,potential suitable habitat for D.frontalis in China was predicted using CLIMEX and ArcGIS.The results show that D.frontalis has a wide potential distribution in China.Predicted optimum areas for establishment were most of north and southwestern China,including Shandong,Henan,Shanxi,Anhui,Shanxi,Hubei,Sichuan,Yunnan.

Three new records,including Paratrichodorus minor extracted from maize(Zea spp.),and Paratrichodorus renifer extracted from Azalea spp.,as well as Paratrichodorus porosus extracted from Lilium spp.,were morphologically described in Yunnan province,China.Male was not found in the three populations.Compared with the description in the literature,Paratrichodorus renifer in potted azalea was smaller in a value and shorter in body length,and there was rarely intestine and pharyngeal overlapping.Paratrichodorus porosus in Lilium spp.was longer in body length and bigger in b value,while both a value and V value were smaller.The body length of Paratrichodorus minor is smaller,and the onchiostylet of this species is shorter,while the a value is smaller.

A new record species on banana from Hekou of Yunnan Province in China,Trichodorus cedarus Yokoo,was described.Compared with the measurements in literatures,the average body length of the trichodorids on banana was longer than those of other specimens in China.The average onchiostyle length was shorter than those on peach and fir,but longer than those on pear and apple.

本文描述了中缅接壤的瑞丽边境区疫情监测发现我国尚无分布的4种检疫性有害生物董里实蝇Bactrocera(B.)aethriobasis(Hardy)、瑞丽果实蝇Bactrocera(B.)ruiliensis Wang,Long et Zhang,sp.nov.、桃果实蝇Bactrocera(B.)zonata(Saunders)和拟黑颜实蝇Bactrocera(Zeugodacus)proprediaphora Wang,Xiao et Chen,sp.nov.的形态特征,并附实蝇特征图.