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请用化学用语填空．某微粒的结构示意图为该微粒的符号 ．
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如图所示为某微粒的结构示意图1若Y=2该微粒的化学符号为2若Y=8该微粒填一定或不一定是离子3若X=
请用化学用语填空1某微粒的结构示意图为该微粒的符号_______________2稀有气体氦的化学式
请用恰当的化学用语表示下列问题的答案1空气中含量最多的气体是地壳中含量最多的金属元素是构成氯化钠的微
某元素R.的微粒结构的意图为该元素的原子核内有个质子X.的最大值是此进该微粒的化学符号为
某同学在画某种元素的一种单核微粒的结构示意图时忘记在圆圈内标出其质子数请你根据下面的提示做出自己的判
请用化学用语填空． 12个氮分子． 2某微粒的结构示意图为该微粒的符号是． 3保持氧气化学性
请用化学用语填空.12个氮分子.2某微粒的结构示意图为该微粒的符号是.3保持氧气化学性质的最小微粒.
某微粒的结构示意图如图1当n=10时该结构示意图表示.填微粒符号下同2当n=13时该结构示意图表示.
化学基础知识是学好化学的关键请按下列要求填空.1请用化学符号填空①氢元素②铜原子.2图1是某微粒的结
请用化学用语填空1某微粒的结构示意图为该微粒的符号__________2稀有气体氦的化学式_____
请用化学用语填空12个氮分子__2某微粒的结构示意图为该微粒的符号是____3保持氧气化学性质的最小
化学用语是学习化学的基本工具请用化学符号或化学式填空1某粒子的结构示意图为其符号为2氧化镁中镁元素化
下图是某反应的微观示意图请回答1该化学反应的基本反应类型属于2用化学用语填空该化学变化过程中①能再分
某微粒的结构示意图为下列有关该微粒的说法错误的是
该微粒的原子核内有11个质子
该微粒在化学反应中最容易失去1个电子
该微粒的原子核外有3个电子层
该图表示的微粒是一种离子
如图为某微粒结构示意图根据图回答问题1若该微粒为原子X=在化学反应填得到或失去电子.2若该微粒为离子
请用化学用语填空12个氮分子2某微粒的结构示意图为该微粒的符号是3保持氧气化学性质的最小微粒
请用化学用语填空1某微粒的结构示意图为该微粒的符号_______________2稀有气体氦的化学式
请用化学用语填空 1某微粒的结构示意图为该微粒的符号是． 2保持干冰化学性质的最小微粒．
化学基础知识是学好化学的关键请按下列要求填空.1请用化学符号填空①氢元素_____②两个氢分子___
某微粒的结构示意图为下列有关该微粒的说法错误的是
该微粒的原子核内有11个质子
该微粒在化学反应中最容易失去1个电子
该微粒的原子核外有3个电子层
该图表示的微粒是一种离子
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用适当的方法解下列方程4x2-12x-1=0
下图所示的四个图象能正确反映对应变化关系的是A．①等质量的木炭分别在足量的空气中和氧气中燃烧B．②铜片在空气中加热C．③加热一定量的氯酸钾和二氧化锰的混合物制取氧气D．④20℃时向一定量接近饱和的氯化钾溶液中加入氯化钾固体
用适当的方法解下列方程4x²=12x+3
Ourchildrenandgrandchildrenmaynothaveachancetovisitmanyofthemostfamousplacesaroundtheworld.Warweatheragetrafficandpollutiondamage破坏thesefamousplaces.Ifwedonothingtheymayevennolongerremain.Butlookingaftertheseplacesoftencostsmorethanonecountrycanafford. Intheearly1970sworldgovernmentsdecidedthatiftheyjoinedtogethertheywouldbeabletopreserve保护ourhistory.Ifeverycountrypaidsomemoneytheysaiditwouldbepossibletolookafterimportanthistoricplaces.ForthisreasoncountriesaroundtheworldunitedtoformtheWorldHeritageOrganizationin1972.Todaytheorganizationhelpstoprotectandrebuildthemostimportantplacesfromourhistory. Howeveroneofthebiggestproblemsforhistoricplacesisvandalism.Thatistosaypeoplesometimesentertheseplacesanddamagethebuildings.AtsomeplacessuchasStonehengeinEnglandgovernmentshavebuilthighfencestoprotectitfromvandals. Therearemanydifferentideasabouthowtosolvetheproblemofvandalism.Someprofessorssaythatifguardskeepwalkingaroundtheseplacesvandalswon'tbeabletogetin.Someprofessorssaythatiftheyfixmoretelevisioncamerastheywon'tneedsomanyguards.Otherssaythatthebestwayiseducation.Ifpeoplelearntorespecthistorytheywon'tdamageit.Theywillalsowanttospendmoneylookingafteroldplaces.ForthisreasontheWorldHeritageOrganizationhelpstospreadinformationaboutthevalueofhistoricplaces. 32.Ourchildrenandgrandchildrenmaynothaveachancetovisitmanyofthemostfamousplacesaroundtheworldprobablybecause. A.theydon'thaveenoughmoneytogothere B.theseplacesmaydisappearinthefuture C.governmentsdon'tallowthemtoenter D.theyareafraidoftheguardsthere 33.TheWorldHeritageOrganizationwassetupforthefollowingreasonsEXCEPT. A.Itwouldbeabletohelppreserveourhistory. B.Nocountrieswantedtoprotectthehistoricplaces. C.Itwouldcollectmoneytorebuildthedamagedplaces. D.Itwouldbepossibletotakecareofimportanthistoricplaces. 34.Whichofthefollowingshowsustheactionofvandalism? A.Peopleentertheplacesanddamagethebuildings. B.Governmentsbuildhighfencestoprotecttheplacefromvandals. C.Guardswalkaroundtheseplacesandfixmoretelevisioncameras. D.Warweatheragetrafficandpollutiondamagethesefamousplaces. 35.What'sthebestwaytosolvethebiggestproblemofvandalism? A.Tospendmoremoneylookingaftertheseplaces. B.Tomakeguardspreventvandalsgettingin. C.Tofixmoretelevisioncamerasintheseplaces. D.Tomakepeopleknowaboutthevalueofhistoricplaces.
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