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为方便学生饮水，某学校在各个教室安装了饮水机．如图是饮水机的电路图，S是一个温控开关，R1为电加热管．当饮水机处于加热状态时，水被迅速加热；达到100℃后，S自动切换到保温状态，A、B是两种不同颜色...
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目前许多学校安装了直饮水机其主要工作流程如图甲.1①的作用是.A.杀菌消毒B.吸附杂质C.蒸馏D.过
某中学为解决同学们的饮水问题给每个班级配备了一台饮水机如图16所示是该类型的饮水机的工作电路原理图图
如图所示是家用饮水机的工作原理图当水温升高到一定温度时饮水机从加热状态自动切换到保温状态R=55ΩR
如图所示为某电热饮水机的电路原理图饮水机有加热和保温两种工作状态饮水机热水箱内水温达到92℃时开关S
小波班上有一台饮水机它的铭牌如下表工作电路如图所示S0是温控开关可以自动控制饮水机的加热或保温状态1
某品牌饮水机生产一种饮水机和饮水机槽饮水机每台定价350元饮水机桶每只定价50元长方开展促销活动期间
某中学为解决同学们的饮水问题给每个班级配备了一台饮水机如图所示是该类型饮水机的工作电路原理图.图中R
某中学为解决同学们的饮水问题.给每个班级配备了一台饮水机下图所示是该类型饮水机的工作电路原理图图中R
某饮水机的工作原理可简化为图8所示的电路其中R.1为加热电阻当饮水机处于加热状态时水被迅速加热达到预
因为能够有选择的提供热水和冷水冷热饮水机受到普遍欢迎当水被加热或冷却至设定温度后饮水机会自动由制热状
某电热饮水机有加热和保温两种功能可由机内温控开关S0进行自动控制如图为其电路原理图通电后开关S0闭合
教室内的实物如桌椅柜子饮水机等应经常变动位置让学生有新鲜感
图16所示为某电热饮水机的电路原理图饮水机有加热和保温两种工作状态饮水机热水箱内水温达到92℃时开关
目前许多学校安装了直饮水机其主要工作流程如图甲.1①的作用是.A.杀菌消毒B.吸附杂质C.蒸馏D.过
小波班上有一台饮水机它的铭牌如下表工作电路如图所示S0是温控开关可以自动控制饮水机的加热或保温状态1
如图1所示的是一种WSH﹣500型号家用饮水机及铭牌如图2是饮水机的电路图.1现将质量为0.5kg初
目前许多公共场所安装了直饮水机其主要工作流程如图甲.其中①中活性炭的作用是③的作用是.直饮水机使用方
小红家里有一台饮水机它铭牌上标出的有关数据如下表工作电路如图所示S0是温控开关当开关S.闭合S0断开
某品牌电热饮水机加热功率保温功率分别为950W40W如果饮水机一天按24h计算有2h处于加热状态其余
如图示为一台饮水机的使用警告标示警告语中要求使用带有地线的三孔插座的目的是
防止使用时饮水机的电压过大
防止使用时饮水机外壳带电使用人触电
防止使用时饮水机的电流过大
为了让饮水机外壳与大地绝缘
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Geneticengineeringinitsbroadestdefinitionmeanstocontrolaspeciessothataparticulartraitisincreasedinthepopulation.Atraitishowanorganism有机体looksoractsorwhatitdoes.Havingbrowneyesisatrait.Flyingincirclesisatrait.Climbingtreesisatrait. Theearliestformsofgeneticengineeringoccurredonfarms.Peopleselectedseedsfromplantsthathadmorefruitproductionortastierleavesthanotherplantsoftheirtypes.Thentheychosetosavetheseedsfromthebestofthatgrouptosowthenextyear.Soyearbyyearthefarmersproducedbetterandbettercrops.Thistypeofactivityprobablyhasbeengoingonsincemankindfirstsettledinvillagesandbeganmakingalifeforthemselvesinonelocationabout12000yearsago! Thesamesortofthingwouldhavealsohappenedwithanimals.Forexamplepeoplechosetoeattheanimalsthatdidn'thavefavorabletraitsandlettheanimalswiththefavorabletraitsreproduce.Itwasthousandsofyearsbeforemankindfiguredouthowplantsandanimalsreproducethemselves.Withthisknowledgepeoplecouldpollinate授粉plantsbyhandorkeepapairofanimalstogetherinordertodeliberatelycauseanincreaseinafavorabletrait. Itwasonlyinthelast250yearsthatscientistsbeganfiguringoutchromosomes染色体andgenesandtheroletheyplayinthewayonegenerationpassesitstraitsontothenext.Andit'sonlybeeninthelast30yearsthatscientistshavebeenabletocutoutspecificgenesfromoneorganismandputtheminanother.Itisthis30﹣year﹣oldtechnologythatisdescribedbythenarrowdefinitionofgeneticengineering.Mankindhaslongbeenabletohaveadeliberateimpactontheworldaroundhim.Henowpossessesthetoolstodeliberatelyimpacthimself.Somepeopleareafraidofwhatmightbedonewiththatpower. 1Thetextismainlydevelopedby. A.askingquestions B.examiningdifferences C.makingcomparisons D.givingexamples 2Paragraph2mainlytalksabout. A.thespreadofgeneticengineering B.theadvantageofgeneticengineering C.theoriginalapplicationofgeneticengineering D.thepopularityofgeneticengineering 3Theunderlinedwordtheminthelastparagraphrefersto. A.specificgenes B.specialtraits C.chromosomes D.scientists 4Whatcanwelearnaboutgeneticengineeringfromthelastparagraph? A.Ithasahistoryof250yearsbythenarrowdefinitionofgeneticengineering. B.Scientistsdon'tknowhowtomakegooduseofit. C.Peoplehaveamisunderstandingofitinthepast30years. D.Itisbecomingapowerfultoolofmankind.
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