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浙江省温州十五校联合体2019-2020学年高二下学期期中考试通用技术试题答案

高三试卷 2020-05-15 00:08:59 0
浙江省温州十五校联合体2019-2020学年高二下学期期中考试通用技术试题答案,扫描并关注下面的二维码,获取相关答案!
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"高考生物生物实验中必考的药品和器材高考很多考生觉得化学实验难,其实生物实验也不简单,所以大家要引起足够的重视,今天小编将生物实验中必考的药品和器材汇总如下,希望能帮到大家! 实验中阅读理解首先要做到的就是掌握所读材料的主旨和大意,它是全文的概括与总结。能否抓住这个中心,取决于读者的总结能力。每篇短文都有其主题思想,而作者表现主题思想的手法各不相同。这就需要我们挖掘相同点,寻找解题的方法。常用器材和药品的使用:1、NaOH:用于吸收CO2或改变溶液的pH2、Ca(OH)2:鉴定CO二、物理选择题的答题技巧23、CaCl2:提高细菌细胞壁的通透性4、HCl:解离(15%)或改变溶液的pH5、NaHCO3:提供CO2、作为酸碱缓冲剂6、酸碱缓冲剂(Na2CO3/NaHCO3,Na2HPO4/NaH2PO4):用于调节溶液pH7、NaCl:配制生理盐水(0.9%)或用于提取DNA(0.14M或2M)8、琼脂:激素或其他物质的载体或培养基,用于激素今天让我们继续学习小王子第二章——认识小王子,如果可能,大声朗读出来吧!SoIlivedmylifealone,withoutanyonethatIcouldreallytalkto,untilIhadanaccidentwithmyplaneintheDesertofSahara,sixyearsago.Somethingwasbrokeninmyengine.AndasIhadwithmeneitheramechanicnoranypassengers,Isetmyselftoattemptthedifficultrepairsallalone.Itwasaquestionoflifeordeathforme:Ihadscarcelyenoughdrinkingwatertolastaweek.Thefirstnight,then,Iwenttosleeponthesand,athousandmilesfromanyhumanhabitation.Iwasmoreisolatedthanashipwreckedsailoronaraftinthemiddleoftheocean.Thusyoucanimaginemyamazement,atsunrise,whenIwasawakenedbyanoddlittlevoice.Itsaid:""Ifyouplease--drawmeasheep!""""What!""""Drawmeasheep!""Ijumpedtomyfeet,completelythunderstruck.Iblinkedmyeyeshard.Ilookedcarefullyallaroundme.AndIsawamostextraordinarysmallperson,whostoodthereexaminingmewithgreatseriousness.Hereyoumayseethebestpotraitthat,later,Iwasabletomakeofhim.Butmydrawingiscertainlyverymuchlesscharmingthanitsmodel.That,however,isnotmyfault.Thegrown-upsdiscouragedmeinmypainter'scareerwhenIwassixyearsold,andIneverlearnedtodrawanything,exceptboasfromtheoutsideandboasfromtheinside.NowIstaredatthissuddenapparitionwithmyeyesfairlystartingoutofmyheadinastonishment.Remember,Ihadcrashedinthedesertathousandmilesfromanyinhabitedregion.Andyetmylittlemanseemedneithertobestrayinguncertainlyamongthesands,nortobefaintingfromfatigueorhungerorthirstorfear.Nothingabouthimgaveanysuggestionofachildlostinthemiddleofthedesert,athousandmilesfromanyhumanhabitation.WhenatlastIwasabletospeak,Isaidtohim:""But--whatareyoudoinghere?""Andinanswerherepeated,veryslow"的转移或培养基9、酒精:用于消毒(75%)、提纯DNA(95%)、叶片脱色、配制解离液(95%的冷酒精)及洗去浮色(50%)10、蔗糖:配制蔗糖溶液,测定植物细胞液浓度或观察质壁分离和复原11、二苯胺:用于DNA的鉴定(沸水浴,蓝色)12、甲基绿:检测DNA,呈绿色13、吡罗红:检测RNA,呈红色14、苔黑酚乙醇溶液:用于RNA的鉴定15、斐林试剂"
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