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钨酸(H2WO4)中钨元素的化合价为( )
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江西武宁白钨矿储量丰富有望成为世界钨都白钨矿主要成分是钨酸钙CaWO4其中钨元素的化合价为
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湖南是有色金属之乡钨元素符号W.的储藏量很大白钨矿的主要成分是钨酸钙CaWO4其中钨的化合价为
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我国蕴藏着丰富的钨矿资源冶炼金属钨常用白钨矿石其主要成分是钨酸钙CaWO4钨酸钙中钨W.的化合价为
-6
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钨是熔点最高的金属广泛应用于拉制灯丝有光明使者的美誉冶炼金属钨常用到白钨矿石其主要成分是钨酸钙CaW
-6
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钨是熔点最高的金属广泛应用于拉制灯丝有光明使者的美誉冶炼金属钨常用到白钨矿石其主要成分是钨酸钙CaW
-6
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江西武宁白钨矿储量丰富有望成为世界钨都白钨矿的主要成分是钨酸钙CaWOx其中钨元素的化合价为+6价则
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金属钨W可做灯泡的灯丝钨合金材料非常坚硬和耐磨耐热用黑钨矿含有FeWO4与Na2CO3混合在空气中焙
厦钨股份正在研究和利用的白钨矿其有效成分CaWO4中钨元素W.的化合价为
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江西赣州被称为世界钨都.冶炼金属钨W的重要反应是X+3H2W+3H2O.下列说法中不正确的是
钨属于金属元素
该反应中钨元素的化合价没有变化
X的化学式为WO
3
该反应前后氢元素的化合价升高
江西武宁白钨矿储量丰富有望成为世界钨都白钨矿主要成分是钨酸钙CaWOX其中钨元素的化合价为+6价则X
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钨是熔点最高的金属广泛应用于拉制灯丝有光明使者的美誉冶炼金属钨常用到白钨矿石其主要成分是钨酸钙CaW
+6
+4
-6
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钨是熔点最高的金属广泛应用于拉制灯丝有光明使者的美誉冶炼金属钨常用到白钨矿石其主要成分是钨酸钙CaW
-6
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白钨矿的主要成分是钨酸钙CaWO4其中钨元素W.的化合价是
+2
+3
+6
+7
冶炼金属钨常用白钨矿石其主要成分钨酸钙CaWO4中钨W.的化合价为
+4
+6
+7
-6
钨是熔点最高的金属广泛应用于拉制灯丝有光明使者的美誉冶炼金属钨常用到白钨矿石其主要成分是钨酸钙CaW
-6
+4
+6
+7
钨是熔点最高的金属广泛用于拉制灯丝有光明使者的美誉冶炼金属钨所用的白钨石中的主要成分是钨酸钙CaWO
-6
+4
+6
+7
钨是熔点最高的金属广泛应用于拉制灯丝白钨矿是冶炼金属钨的常用原料其主要成分是钨酸钙CaWO4钨酸钙中
-6
+4
+6
+7
冶炼金属钨常用到白钨矿石其主要成分是钨酸钙CaWO4钨酸钙中钨W的化合价为
-6
+4
+6
+7
钨是熔点最高的金属广泛应用于拉制灯丝有光明使者的美誉冶炼金属钨常用到白钨矿石其主要成分是钨酸钙CaW
-6
+4
+6
+7
钨是熔点最高的金属广泛应用于拉制灯丝有光明使者的美誉冶炼金属钨常用到白钨矿石其主要成分是钨酸钙CaW
+4
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如图所示在竖直平面内用轻质细线悬挂一个小球将小球拉至P点使细线处于张紧状态.由静止开始释放小球到最低点Q处细线恰好断裂若不计一切阻力下列说法正确的是
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Last'weekataconstructionsitenearAustinTexasworkersheardthecriesofapuppy小狗.Theywentaroundtheconstructionsitetryingtofigureoutwherethesecrieswerecomingfrom.Theyfiguredthepuppywastrappedsomewhere.Thentheyrealizeditwasactuallycomingfromthesky.Highabovetheirheadsapuppywasflyingthroughtheair﹣intheclawsofahawk鹰.Atthatverymomentthebirdsuddenlyletgoandthetinyscreamingpuppy﹣noolderthan6weeksold﹣felltothem. Asidefromafewminor.woundsonhisheadthepuppywassurprisinglyunhurt.TheworkersquicklybroughthimtoamedicalclinicandfromtherethepuppyfoundhiswayintothecareoftheAustinAnimalCenter.Wedon'tknowwherehecamefrom﹣whetherhewasbornasastray流浪狗orwhetherhewasinahomeandgotoutOlohancommunicationsdirectorfortheAustinAnimalCenterexplains. TheparatroopergotanewnamethatcamenaturallyHewouldbecalledTonyHawk.Consideringhistininess﹣notmuchbiggerthanamouse﹣TonyHawkprobablyseemedlikeagoodideatoahungryhawk.TonyHawk'sfearscalmeddownsoonafterhefoundhimselfonthegroundmostlybecausehefoundafosterhometoeasehimintohisnewlife.Inamonthorsohewillbelookingforaforeverhome. Olohanthinkshewon'twaitlong.We'vehadplentyofinteresttonsofapplicationsforhimshesays.He'scertainlynotgoingtohaveaproblemfindingahome.Soatinypuppywithoutapastfoundhimselffreefromtheclaws﹣thankstothewarmcaringhandsthatwillhelphimshapeabrandnewfuture. 1Whathappened.tothelittlepuppy? A.Hefellfromabuilding. B.Hewascaughtbyahawk. C.Hewastrappedsomewhere. D.Hewasseriouslywounded. 2Whatdidtheconstructionworkersdotohelpthepuppy? A.Theytookhimtomedicalcare. B.Theyfoundafosterhomeforhim. C.Theyprotectedhimfrombirdattack. D.Theygotsomeinformationabouthispast. 3Whatdidtheparatrooperinparagraph3? A.Astray. B.Amouse. C.Thehawk. D.Thepuppy. 4WhatcanweinferaboutTonyHawk? A.Heisveryfierce. B.Hewillbeadoptedsoon. C.Hehasadaptedtonewlife. D.Hefacesalotofproblems.
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两支蜡烛用木棒相连接设法在其木棒中间插入一枚缝衣针把针的两端分别放在两个玻璃杯上将两端同时点燃发现蜡烛可以绕针轴上下来回摆动如图所示.关于此装置下列说法中正确的是
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如图电路电源电压恒为3VR1=10ΩR2是规格为“20ΩlA”的滑动变阻器.闭合开关S后在向左移动滑片P的过程中下列说法正确的是
小明查阅资料了解到出于安全考虑电梯都设置超载自动报警系统其工作原理如图甲所示电路由工作电路和控制电路组成在工作电路中当电梯没有超载时触点K与触点A接触闭合开关S电动机正常工作当电梯超载时触点K与触点B接触电铃发出报警铃声闭合开关S电动机不工作.在控制电路中已知电源电压U=6V保护电阻R1=100Ω电阻式压力传感器压敏电阻R2的阻值随压力F大小变化如图乙所示电梯底架自重和电磁铁线圈的阻值都忽略不计. 1在控制电路中当压敏电阻R2受到的压力F增大时其阻值减小从而使电磁铁的磁性填“增强”“减弱”或“不变”. 2某次电梯正常运行时测得通过的电磁铁线圈的电流为10mA此时电梯载重为多少 3若电磁铁线圈电流达到20mA时衔铁刚好被吸住电铃发出警报声.当该电梯厢内站立总质量为1000kg的乘客时试通过计算说明电梯是否超载g取10N/kg
下列属于复合肥的是
当前人工智能AIArtificialIntelligence技术正渐渐进入人们的生活像无人机家居机器人等.都是人工智能的初级应用一些高级人工智能应用如无人驾驶系统正在研发中.下列有关人工智能AI以及科学知识的描述合理的是
A.Youareonlyallowedtopuxchaseafirearmifyouhavehadabackgroundcheckandmeetcertainlegalrequirements. B.TherehavebeenmanyenlighteningarticlesonguncontrolinAmerica. C.IfyouweretovisittheUnitedStatesfortwomonthstheonlygunyoumightseeisinamuseumoronapoliceofficer. D.LessthanfiftypercentofhomesintheUnitedStatesownweaponsandmanyofthosehomesareinruralareaswheregunsmayhaveagreateruse. E.Morepeoplearedecidingtolegalizetheirguntransactionsinsteadofbuyingthemontheblackmarket. F.WhatalarmspeoplethemostaboutAmericangunculturearetheillegalgunsandshootingwhichmakesomeplacesfeelunsafe. GunshaveaspecialplaceinAmericancultureandthoughnoteveryoneagreesonwhetherornottheyareagoodthingthereisnomistakingthattheywillbepartoftheculturallandscapeforsometime.Toanswerthequestionnonoteveryonehasagun.67 Americansusegunsforoneoftwouseseitherforsportwheretheycanusethemonfiringrangesorforhuntinginapprovedareasorforself﹣protection.Thelatteriswheremostpeoplebegintotakesideseitherarguingfortheremovalofgunsfromsocietyorallowingmorepeopletohavethem.Thereareorganizationsandcommunitygroupsforbothsidesandbothsideshavestrongfeelings. Legallytherearerestrictionsongunowners.68Onlycertainkindsofweaponscanbepurchasedbythepublicandthatexcludesautomaticweaponandmilitarygradeweaponry.Gunownersmusttransporttheirweaponinasafewayunloadedandinmostcasesoutofsight.Specialconcealedcarrypermitsfromthepolicestationmustbeobtainedforpeoplewhowanttowearweaponandmostpeoplearerejectedforthiskindofpermit.69Criminalsstealgunsorbuythemillegallytocommitcrimesandthenewsisfullofterriblestoriesofwhathappenednext.Occasionallyachildwillgetaholdoflegalweaponandaccidentallyhurtthemselvesorothers. ItisimportanttorememberhoweverthatthenewsstoriesthatmaketheUnitedStatesseemlikeadangerousplacearedeceivinggunsarcnoteverywhereorconstant.70AfterallAmericaisasafeplacetolive.
图甲是一个豆浆机的实物图豆浆机的中间部位是一个电动机电动机通过金属杆带动其下部的刀片旋转从而将原料粉碎打浆刀片外部是一个环状加热管电热丝用来对豆浆加热该豆浆机的部分参数如表所示.制作豆浆的过程是加热和打浆交替进行图乙是该豆浆机做好一次豆浆的P﹣t图象.求 1加热管正常工作时电阻丝的阻值是多少 2在8~11分钟的时间内设豆浆质量为1.5kg比热恒为4×103J/kg•℃加热管产生的热量全被豆浆吸收到第11分钟时豆浆温度恰好为100℃则第8分钟时豆浆温度为多少 3豆浆机在粉碎打浆时电动机的内阻为40Ω则电动机输出的机械功率是多少
如图所示对于图片中所描述的物理过程下列分析中正确的是
TheSecrettoSurvival In2006ateenagernamedBillwhowaslateforworkdrovethroughthecitysofastthatheknockedintomycar.Afterthe1Ispentthenextmonthinhospital.The2wasabout$130000.Totopitoffdoctors3itwouldtakeanentireyearformetorestoretohealth. Itseemedasifitwasn't4thatIwasalreadydealingwithpoverty贫困andmusculardystrophy肌肉萎缩症.Solifedecidedtopileonalittle5justtoseehowmuchIcould6.Atthattimemylifeseemedtotally7. How8wouldithavebeento9desperation?Orangeragainstthe10?ButIdidn't.InsteadI11myselftosayOkaythisismylifenow.What'snext?AfterallIcouldn't12whathadhappened.TheonlythingIhadcontroloverwashowI13tothatchange.Andthefirstandmost14responsewastotalandcomplete15.Alotofpeopleviewitas16.Theythinkthatiftheyacceptwhat'shappenedtothemthey'llbe17defeat.Butit'stheopposite.It'sonlyby18realitythatyoucancreateaplantochangethatreality.Acceptanceisthefirststeptoyour19. 20Ifoundwaystocoverthemedicalexpenses.MeanwhileitonlytookmesixmonthstorecoverinsteadofayearasdoctorspredictedandIrestartedmylifeevenhealthier. 1A.accident B.meeting C.coincidence D.treatment 2A.car B.bill C.reward D.fine 3A.predicted B.promised C.argued. D.permitted 4A.fair B.ordinary C.special D.enough 5A.work B.regret C.comfort D.extra 6A.lose B.earn C.take D.pay 7A.hopeless B.lonely C.pointless D.busy 8A.lucky B.easy C.unusual D.wonderful 9A.getridof B.sinkinto C.smell D.face 10A.discrimination B.punishment C.misfortune D.abuse 11A.allowed B.forced. C.forbade D.expected 12A.change B.explain C.plan D.announce 13A.responded B.linked C.contributed D.submitted 14A.desired B.natural C.vital D.aggressive 15A.resistance B.acceptance C.agreement D.commitment 16A.virtue B.courage C.weakness D.challenge 17A.valuing B.avoiding C.foreseeing D.admitting 18A.escaping B.representing C.ignoring D.acknowledging 19A.world B.health C.victory D.independence 20A.Eventually B.Generally C.Exactly D.Normally
下列实验操作不正确的是
下列常见的生活物品所含的主要材料属于有机合成材料的是
下列有关说法正确的是
电动机是一种使用广泛地动力机械.从能量转化的角度看它主要是把电能转化为机械能还有一部分能量在线圈中以热量的形式散失掉. 1安装完毕闭合开关后发现电动机的转动方向与要求的相反他们怎样做才能达到要求 2如果某电动机线圈的电阻为R电动机工作时两端的电压为U通过电动机的电流为I请推导此电动机电能转化为机械能的效率. 3改进实验后使电动机转轴转动移动滑动滑片记下电压表和电流表的示数数据记录如下如在正常工作时转子突然被卡住此时电动机的发热功率多大
下列变化中属于物理变化的是
无论有多么不满我父母都不会在我的朋友面前使我感到难堪.Nomatter.
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