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第一节Is Distance Learning Really Beneficia[文]l?With the developme[章]nt of the Internet distance learning is gaining more andmore popularit[来]y among students many of them are addicted to online lessons Isdistanc[自]e learning really beneficia[知]l?In my opinion, distance learning has some advantage[嘛]s. As we know, it is vividand flexible because of video materials[答] and adjustabl[案]e schedules[网]. however itsdisadv[文]antages should be equally paid attention[章] to. Firstly it isn't suitable forstuden[来]ts who prefer direct communica[自]tion with teachers Worse still, studyingo[知]nline too long greatly harms students' eyes. So students should weigh theadvant[嘛]ages and disadvant[答]ages and use distance learning properly.[案]
18.D解析：根据[网]电场线垂直于等势面[文]、电场线的方向是电[章]势降落最快的方向，[来]得到A、B两点的电[自]场强度大小相等，方[知]向不同，A项错误：[嘛]将一负检验电荷由O[答]点沿竖直方向移动到[案]F点，电场力对该电[网]荷做负功，B项错误[文]，根据E。=q9,[章]PA>Pc,[来]EM>Ec,[自]C项错误；根据PD[知]一Pc=EDc大d[嘛]cD>ED小[答]dne=PE-PD[案],有Po>2[网]（pc十PE)=-[文]10V,D项正确.[章]
