- 问题详情:如图所示,在水平向右的匀强电场中,有一电荷量为q=-4×10-7C的负点电荷从A点运动到B点,电场力做功为WAB=3.2×10-6J,AB间距离L=4m,与水平方向夹角为;求:(1)电荷的电势能是增加还是减少?增加(减少)了多少?(2)B、A间电势差UBA是多少?(3)电场强度E是多大?(4)如果A点的电势为-4V,求B点的电势...
- 18706
- 问题详情:读写综合;信息归纳下面是“今日视线”栏目播出的一则报道。请仔细阅读报道的内容。每小题填写不得超过3个单词。WangFanglivesinatallbuilding.Shegetsonwellwithallherneighbors.Buttwoweeksago,anewfamilymovedinnextdoor.Therearetwoboysandagirlinthenewfamil...
- 25566
- 问题详情:--WherewereyouwhenIcalled?--I onthebedA.lied B.waslying C.lay D.waslieing【回答】B知识点:动词时态题型:选择题...
- 25129
- 问题详情:已知短周期元素A、B、C、D最高价氧化物对应的水化物分别为X、Y、Z、W,A是短周期中原子半径最大的元素,常温下X、Z、W均可与Y反应,A、C、D的原子序数及0.1mol·L-1X、Z、W溶液的pH如图3所示,下列说法正确的是A.B的原子半径大于A的原子半径 B.C单质可从D的化合物...
- 14229
- 问题详情: Iwasindesperateneedofa“witchinghour”,wasuponusonceagain,dinnerwasburningonthestove,andfightswere 41 betweenmytwocryingwasnever-endingandIwas 42 theendofmyIwasholdingdownthefortuntilwayafterbedtime. I 43 afri...
- 5031
- 问题详情:Thedriverwhodiedintheaccidentcouldhave,buthewassenttohospitaltoolate. A.cured B.recovered C.survivedD.rescued【回答】C知识点:动词题型:选择题...
- 19658
- 1、InstituteCargoClauses-W.A.2、CoveringriskorW.A.asperInstituteCargoClauses(W.A).3、DoyoucoverrisksotherthanW.A.andWarRisk?...
- 29505
- WApilotssaidsurveillanceflightscontinuedoutofAlbanyforsomedays,costinga"truckload"ofmoney.WA8487isamixtureofprotein,waxandsoapedoilwhichprovideswarm,oilyandwaxyfeel.WA高品质*芯焊丝,我们生产世界上品种最全的硬面堆焊焊丝;ThecapitalofWesternAustralia(WA)...
- 20658
- 问题详情:请认真阅读下面短文,并根据所读内容在文章后表格中的空格里填入一个最恰当的单词。注意:每个空格只填一个单词。WARNING:Holdingacellphoneagainstyourearorstoringitinyourpocketmaybedangeroustoyourhealth.Thisparaphrases(解释)awarningthatcellphonemanufactu...
- 17284
- 问题详情:请根据句意从方框中选择合适的动词,并用其适当形式填空,使句子通顺。 feel fix meet watch have1.Heoften________thebrokenbikesandmachinesforhisneighbors.2.It’s6:00o’clock.He,withhisfamily________ supperatthetable.3.Ihopeyou___...
- 18310