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人体中的钙元素主要以羟基磷酸钙[Ca10(PO4)6(OH)2]的形式存在于骨骼和牙齿中,关于羟基磷酸钙的说法正确的是( )
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人体中的钙主要以羟基磷酸钙[Ca10PO4xOH2]形式存在于牙齿和骨骼中使牙齿和骨骼具有坚硬的结构
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羟基磷酸钙[Ca5OHPO43]是制造人工骨人工关节和人造假牙的重要原料羟基磷酸钙中磷元素的化合价是
-3;
+3;
+4;
+5。
乳牙牙釉质中的矿物盐主要是羟基磷灰的结晶其化学式为Ca10PO46OH2
钙是人体中含量较多的元素之一幼儿及青少年缺钙会得佝偻病和发育不良老年人缺钙会发生骨质疏松容易骨折人体
羟基磷酸钙属于混合物
羟基磷酸钙的一个分子中含有44个原子
羟基磷酸钙由四种元素组成
羟基磷酸钙中磷元素的化合价为+5价
钙是人体中含量较多的元素之一幼儿及青少年缺钙会得佝偻病和发行不良老年人缺钙会发生骨质疏松容易骨折.
羟基磷酸钙属于混合物
羟基磷酸钙的1个分子中含有44个原子
羟基磷酸钙由四种元素组成
羟基磷酸钙中磷元素的化合价为+5价
钙是人体内含量最高的金属元素是构成人体的重要组分人体内的钙主要以羟基磷酸钙[Ca10PO46OH2]
人体中的钙主要以羟基磷酸钙[Ca10PO46OH2]形式存在于牙齿和骨骼中使牙齿和骨骼具有坚硬的结构
羟基磷酸钙是一种碱
羟基磷酸钙是一种有机高分子化合物
羟基磷酸钙由5种元素组成
羟基磷酸钙中磷元素的化合价为+5价
人体内的钙99%存在于骨骼和牙齿中主要以羟基磷酸钙[CaxPO46OH2]晶体的形式存在已知该化合物
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5
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羟基磷酸钙[Ca5OHPO43]是制造人工骨人工关节和人造假牙的重要原料羟基磷酸钙中磷元素的化合价是
-3
+3
+4
+5
钙是人体中含量较多的元素之一幼儿及青少年缺钙会得佝偻病和发行不良老年人缺钙会发生骨质疏松容易骨折.人
羟基磷酸钙属于混合物
羟基磷酸钙的1个分子中含有44个原子
羟基磷酸钙由四种元素组成
羟基磷酸钙中磷元素的化合价为+5价
人体中的钙元素主要存在于骨骼和牙齿中以羟基磷酸钙晶体[Ca10PO46OH2]形式存在牛奶含钙丰富又
人体中钙元素主要以羟基磷酸钙晶体[Ca10PO46OH2]形式存在于骨骼和牙齿中牛奶是含钙丰富又易吸
钙是人体中含量较多的元素之一幼儿及青少年缺钙会得佝偻病和发育不良老年人缺钙会发生骨质疏松容易骨折人体
羟基磷酸钙属于混合物
羟基磷酸钙的一个分子中含有44个原子
羟基磷酸钙由四种元素组成
羟基磷酸钙中磷元素的化合价为+5
人体中钙元素主要存在于骨骼和牙齿中以羟基磷酸钙晶体[Ca10PO46OH2]的形式存在其相对分子质量
人体中钙元素主要存在于牙齿和骨骼中以羟qiāng基磷酸钙[Ca10PO46OH2]形式存在则其化学式
钙是人体内含量最高的金属元素是构成人体的重要组分人体内的钙主要以羟基磷酸钙[Ca10PO46OH2]
人体中的钙元素主要以羟基磷酸钙【Ca10PO46OH2】晶体的形式存在于骨骼和牙齿中下列对羟基磷酸
羟基磷酸钙中钙的质量分数为38%
羟基磷酸钙的一个分子中含有44个原子
羟基磷酸钙中氢氧元素的质量比为1:208
羟基磷酸钙的相对分子质量为1004
人体中含量最多的金属元素是钙钙元素主要以羟基磷酸钙晶体的形式存在羟基磷酸钙是人体牙齿的主要组成部分
羟基磷酸钙中钙元素的化合价为+2价
羟基磷酸钙中氢元素的质量分数最小
羟基磷酸钙中钙.磷.氧.氢四种元素的原子个数比为5:3:13:2
羟基磷酸钙由钙.磷.氧.氢四种元素组成
钙在人体主要存在于骨髓和牙齿中主要以羟基磷酸钙[Ca10PO46OH2]晶体的形式存在磷的化合价为
+1
+2
+3
+5
钙是人体中含量较多的元素之一幼儿及青少年缺钙会得佝偻病和发育不良老年人缺钙会发生骨质疏松容易骨折.
羟基磷酸钙属于混合物
羟基磷酸钙的一个分子中含有44个原子
羟基磷酸钙中H.P元素的质量比为1:93
羟基磷酸钙中磷元素的化合价为+5价
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若函数fx=xlnx﹣ax2有两个极值点则实数a的取值范围是
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已知双曲线中心在原点且一个焦点为F0直线y=x﹣1与其相交于MN两点MN中点的横坐标为﹣则此双曲线的方程是
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函数fx=的图象大致为
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曲线y=x2和曲线y2=x围成的图形面积是
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除把多余的词用斜线╲划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. SinceIwasakidI'veconsidereddifferentjobIwouldliketodo.FirstIwantedtobeafiremanwhoseuniformlookedsocoolly.ThenwhenIwasinthefivegradeIwantedtobeateacherbecauseIlikedmyEnglishteachertoomuch.WhenIstudiedchemistryhighschoolIreconsideredmggoalordecidedtobeadoctor.Theyweretworeasonsforthedecision.OnewasthatIwasamazingatthefactthatasickpersoncouldfeelmuchmorebetterafterseeingadoctor.AndtheotheristhatIwantedtohelppeopleinneed.
Youcanusemeasalastresort选择andifnobodyelsevolunteersthenIwilldoit.ThiswasanactualreplyfromaparentafterIputoutarequestforvolunteersformykids'lacrosse长曲棍球club. Iguessthatthere'sprobablysomedemandingworkscheduleorsocialanxietyaroundsteppinguptohelpforanunknownsport.Shemayjustneedalittlepersuading.SoItryagainandtugattheheartstrings.ImentionthesingleparentwithfourkidsrunningtheshowandItalkaboutthedadcoachingateamthathiskidsaren'tevenon…AtthispointtheunwillingparentspeaksupAlright.YesI'lldoit. I'msecretlyrelievedbecauseIknowthere'srealpowerinsharingvolunteerresponsibilitiesamongmany.Theunwillingparentorganizesthemealschedulesendsoutemailsandcollectsmoneyforend﹣of﹣seasongifts.Somewherealongthewaythesameparentendsupbecominganinvaluablememberoftheteam.Thecoachisabletofocusonthekidswhiletheotherparentsarerelievedtobeoffthehookforanotherseason.Handingoutslicedorangestobloodthirstykidscanbeasexcitingaswatchingyourownkidscoreagoal. Stillmostofusvolunteersbreatheasighofreliefwhentheseasoncomestoaclose.ThatreliefiscoupledwithadeepunderstandingofwhythesamepeoplekeepcomingbackformoreConnectingtothecommunity社区asyoufreelygiveyourtimemoneyskillsorservicesprovidesarealjoy.Volunteeringjustfeelssogood. InthatsenseI'mprettysurevolunteeringismoreofaselfishactthanI'dfreelyliketoadmit.HoweverifothersbenefitintheprocessandIgetsomerewardtoodoesitreallymatterwheremymotivationlies? 1Whatcanweinferabouttheparentfromherreplyinparagraph1? A.Sheknowslittleabouttheclub. B.Sheisn'tgoodatsports. C.Shejustdoesn'twanttovolunteer. D.She'sunabletomeetherschedule. 2Whatdoestheunderlinedphrasetugattheheartstringsinparagraph2mean? A.Encourageteamwork. B.Appealtofeelings. C.Promotegooddeeds. D.Provideadvice. 3Whatcanwelearnabouttheparentfromparagraph3? A.Shegetsinterestedinlacrosse. B.Sheisproudofherkids. C.She'llworkforanotherseason. D.Shebecomesagoodhelper. 4Whydoestheauthorlikedoingvolunteerwork? A.Itgivesherasenseofduty. B.Itmakesherveryhappy. C.Itenableshertoworkhard. D.Itbringshermaterialrewards.
下列关于自然界中碳循环如图的说法中不正确的是
已知曲线C+=1直线lt为参数 Ⅰ写出曲线C的参数方程直线l的普通方程. Ⅱ过曲线C上任意一点P作与l夹角为30°的直线交l于点A求|PA|的最大值与最小值.
在平面直角坐标系xOy中点Px0y0在单位圆O上设∠xOP=α且.若则x0的值为.
MyFavouriteBooks JoUsmarisawriterforCosmopolitanandco﹣authoroftheThisBookWillseries系列oflifestylebooks.Hereshepickshertopreads. Matilda RoaldDahl IoncewroteapaperontheinfluenceoffairytalesonRoaldDahl'swritinganditgavemeanewappreciationforhisstrangeanddelightfulworlds.Matilda'sbattleswithhercruelparentsandthebossyheadmistressMissTrunchbullareequallyfunnyandfrighteningbutthey'realsoaspirational. AfterDark HarukiMurakami It'sabouttwosisters﹣Eriamodelwhoeitherwon'torcan′tstopsleepingandMariayoungstudent.IntryingtoconnecttohersisterMaristartschangingherlifeanddiscoversaworldofdiversenightpeoplewhoarehidingsecrets. GoneGirl GillianFlynn Therewasabitofmethatdidn′twanttolovethiswheneveryoneelseontheplanetdidbutthehorrorstoryisbrilliant.There'stensionandanxietyfromthebeginningasNickandAmybattleforyourtrust.It'sarealwhodunitandthefrustrationwhenyourealisewhat'sgoingonishorriblyenjoyable. TheStand StephenKing Thisisanexcellentfantasynovelfromoneofthebeststorytellersaround.Afteraseriousfluoutbreakwipesout99.4%oftheworld′spopulationabattleunfoldsbetweengoodandevilamongthoseleft.RandallFlaggisoneofthescariestcharactersever. 1WhodoesIrefertointhetextC A.StephenKing. B.GillianFlynn. C.JoUsmar. D.RoaldDahl. 2WhichofthefollowingtellsaboutMariandEriC A.Cosmopolitan. B.Matilda. C.AfterDark. D.TheStand. 3WhatkindofbookisGoneGirlD A.Afolktale. B.Abiography. C.Alovestory. D.Ahorrorstory.
下列除去杂质括号中的物质为杂质的方法中不正确的是
某方便面的营养成分表如下其中碳水化合物主要指淀粉等 1方便面中不含维生素C为补充维生素C可以在煮方便面时加入填写一种食物 2方便面中使用的食盐可以是加碘盐人体中缺碘可能患有的疾病是填“甲状腺肿大”或“骨质疏松”. 3若小明用天然气煮方便面请问天然气主要成份燃烧的化学方程式是. 4对维持人体生命活动不可缺少的营养素是从表中选择 5中国居民膳食指南建议每天食用食盐不超过6克.假设小明某天吃了100克该方便面相当于吃了食盐克保留小数点后一位.
A90﹣year﹣oldhasbeenawardedWomanOfTheYearfor1beingbeBritain'soldestfull﹣timeemployee﹣stillworking40hoursaweek.NowIreneAstburyworksfrom9amto5pmdailyatthepetshopinMacclesfield2whichsheopenedwithherlatehusbandLes.Heryearsofhardworkhave3finallyfinalbeenacknowledgedafteracustomernominated提名hertobeCheshire'sWomanOfTheYear. PickingupherLifetimeAchievementawardproudIrene4declareddeclareshehadnoplans5toretireretirefromher36﹣year﹣oldbusiness.IrenesaidIdon'tseeanyreasontogiveupwork.IlovecominghereandseeingmyfamilyandallthefriendsI6havemademakeovertheyears.IworknotbecauseIhaveto7butbecauseIwantto. GranddaughterGayleParks31﹣whoworksalongsideherinthefamilybusiness﹣saiditremainedunknownastowhonominatedIrenefortheaward.ShesaidWedon'thaveanyideawhoputgrandmaforward.Whenwegotacall8sayingsayshewasshort﹣listedwethoughtitwas9ajoke.Butthenwegotanofficialletterandwewereblownaway.Wearesoproudofher.It's10wonderfulwonder.
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