.AD的精选

问题详情：如图，ABCD－A1B1C1D1为正方体，下面结论错误的是(   )．A．AD∥平面CB1D1                                                         B．AC1⊥BD    ...

问题详情：如图所示，a、b、c、d是正方形的四个顶点，O是正方形对角线的交点．ad边和bc边中点处放有等量异种点电荷+Q、Q，关于图中各点电势和电场强度的关系，下列说法正确的是（  ）A.a、O、c三点的电势关系为B.a、b、c、d四个顶...

问题详情：已知：如图，梯形ABCD与梯形A′B′C′D′相似，AD∥BC，A′D′∥B′C′，∠A＝∠A′．AD＝4，A′D′＝6，AB＝6，B′C′＝12．求：(1)梯形ABCD与梯形A′B′C′D′的相似比k；(2)A′B′和BC的长；(3)D′C′∶DC．【回答】(1)k＝2∶3；(2)A＇B＇＝9，BC＝8；(3)3∶2．知...

问题详情： 设0<p<1，随机变量ξ的分布列是ξ012P则当p在（0，1）内增大时，()．A.D（ξ）减小  B.D（ξ）增大  C.D（ξ）先减小后增大  D.D（ξ）先增大后减小【回答】.D 知识点：统计题型：选择题...

问题详情：如图，△ABC是一张锐角三角形的硬纸片．AD是边BC上的高，BC=40cm，AD=30cm．从这张硬纸片剪下一个长HG是宽HE的2倍的矩形EFGH．使它的一边EF在BC上，顶点G，H分别在AC，AB上．AD与HG的交点为M．（1）求*：；（2）求这个矩形EFGH的周长．【回答】【...

haveanaxetogrind:havepersonaladvantagestogainPortraitphotographyisapersonaladvantagesofamplification.Usetheinsideinformationforpersonaladvantageorthepersonaladvantageofothers"Tip"otherswhomaybuyorse...

AdvaloremdutyoradvaloremtaxadvalorempropertytaxoilandgasproductionequipmentadvaloremtaxAcompoundtariffisacombinationofaspecificandanadvaloremtariff.Compounddutiesareacombinationofspecificandadvaloremd...

That'saninterestingad.aclassifiedad[advertisement]AnadvertisercancreateanAD.So,searchisonlyonepartoftheadmarket.Thoseadduptoaround25minutesofADtime.Anad-servingplatformthatanalyzesproduct-specificsho...

问题详情：如图，AD⊥AE，AB⊥AC，AD＝AE，AB＝AC.求*：△ABD≌△ACE.                                              【回答】*：∵AD⊥AE，AB⊥AC，∴∠CAB＝∠DAE＝90°.∴∠CAB＋∠CAD＝∠DAE＋∠...

Alright,solet'snowstartdoingmoreinterestingthingshellothanjustsayinghelloadnauseamtoourselves.Theprimeminister’sfavouritepronouncement,whichhelikestorepeatadnauseam,isthathisgovernmentwillnever“put...

问题详情：Ad.1SpecialhouseinGlebe(S160everymonth)Replyto:Dateavailable:December9LookingforagirlstudentroommatetoshareawellsituatedhouseinGlebefornotlessthanonemonth.2minutesfromthebusstopinaquietstreet,...

aclassifiedad[advertisement]Sitestodayoffermuchmorethanthetypicalprofilepictureanddescriptioninaclassifiedadlisting.Thesite'sclassifiedadsectionreadslikeabillionaire'syardsale:'Forsale--CaviarServe...

问题详情：.如图,在△ABC中,AD是中线,求*:AD<(AB+AC).【回答】*:延长AD到点E,使DE=AD,连接BE,∴AE=2AD.∵AD是中线,∴BD=CD.在△ACD和△EBD中,∴△ADC≌△EDB(SAS),∴AC=BE.在△ABE中,∵AE<AB+BE,∴2AD<AB+AC,∴AD<(AB+...

问题详情：如下图，CD⊥AD，CB⊥AB，AB=AD，求*：CD=CB.【回答】*：连结AC，CD⊥AD，CB⊥AB∴在Rt△ADC和Rt△ABC中∴Rt△ADC≌△Rt△ABC(HL)∴CD=CB.（本题也可用勾股定理直接*）知识点：三角形全等的判定题型：解答题...

问题详情：如图，AB=AC=AD，若AD∥BC，∠C=78°，∠D=  ．【回答】39°．【解答】解：∵AB=AC=AD，∴∠C=∠ABC，∠D=∠ABD，∴∠ABC=∠CBD+∠D，∵AD∥BC，∴∠CBD=∠D，∴∠ABC=∠D+∠D=2∠D，又∵∠C=∠ABC，∴∠C=2∠D．∵∠C=78°，∴∠D=39°，知识...

问题详情：四棱锥P—ABCD中,底面ABCD为直角梯形,BC//AD,AD⊥DC,BC=CD=l,AD=2,PA=PD,E为PC的中点,F为AD的中点,平面PAD⊥底面ABCD.⑴*：平面BEF⊥平而PAD;⑵若PC与底面ABCD所成的角为,求二面角E—BF—A的余弦值.【回答】知...

Amomentlatertheouterdooropened,brieflyadmittingsunlight,thenYvettewasgone.ThewindownarrativeoftheshallowlotusgreenupusesilkthreadtobrieflyadorntojoinDilotuspattern....

问题详情：Asicklittlegirlisbeingkeptalivethankstoherbestfriend—adogwhocarriesheroxygentankonhisback.Alida’sfaithfuldogcompanionMrGibbshasbeenspeciallytrainedtoshepherdthethree-year-old,whobreathesthro...

问题详情： Ad-makerschoosewordsandbrandnamesverycarefullyinordertomakeacreativeimageoftheproducttheyare_________.      A.processing       B.producing            C.providing  ...

问题详情：如图，AC⊥BC，AD⊥BD，AD=BC，AD，BC交于O.求*：OC=OD.【回答】知识点：三角形全等的判定题型：解答题...

PresidentTheodoreRooseveltofficiallyadoptedthetermin1902.aunitofmeasurementofcapacityforliquidsofficiallyadoptedintheUnitedStatesCustomarySystem.November2,1868,timezone:NewZealandofficiallyadoptsastan...

Herlocaladmirersbeatapathtoherdoor.Bylaunchinglocal-languagewebsites,teamscantailormarketingtofitanindividualcountry,drumminguplocaladvertisingandsponsorshiprevenue.Wemustdevelopindustrieswithlocaladv...

问题详情：AD【回答】如图8所示，光滑固定导轨M、N水平放置，两根导体棒P、Q平行放于导轨上，形成一个闭合回路，当一条形磁铁从高处下落接近回路时()A．P、Q将相互靠拢      B．P、Q将相互远离C．磁铁的加速度仍为g   D．磁铁...

问题详情：如图，已知AB∥DC，AD∥BC.*：（1）AB=CD；（2）AD=BC．【回答】．略知识点：三角形全等的判定题型：解答题...

Forexample,theyearAD2000isequaltotheyear2543BE.DevelopAutoCAD2000withVB;ShowingFEMStresswithAutoCAD2000VBA...