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三相異步電動機是怎樣轉起來的?

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對于三相對稱交流電路,不論星形或三角形接法,下列結論正確的有

電感元件在電路中不消耗能量,它是無功負荷。

實際電壓源與實際電流源的等效互換,對內電路而言是

純電容交流電路中電流與電壓的相位關系為電流()。

晶閘管控制角越大電壓則越高。

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DearSir/Madam, IampleasedtowritealetterofrecommendationonbehalfofSandRiveranditsCEO,Mrs.JaneKing.Iamveryfamiliarwiththecompany.Mynextbookdealswithitindetail,whichistobepublishedinautumnof2018.IamalsofamiliarwithEuropeanconsumer.AsaDutchcitizen,IhavelivedinEuropefor46yearsandstudiedEuropeanconsumerbehaviorfordecades.IbelievethatSandRiverofferssomethinguniquetotheEuropeanmarket.Ithasestablishedlong-termsupplyrelationswithherdsman(牧民)familiesandownsadvancedGermanmachinery.Thusitcombinesnaturalresourceswithmodernmanufacturingtechniques.Butequallyimportant,SandRiverworkswithmodernfashiondesignerstocreatetrulycontemporaryandappealingdesigns.Theresultisanewly-establishedcashmere(羊絨)brandthatappealstoatargetgroupofhigh-incomewomen.ImetMrs.Kingthefirsttimein2013.Sincethen,wehavemetseveraltimesandtalkedaboutSandRiver'sphilosophy,strategy,andappealtobothChineseandinternationalconsumers.Iwasstruckbyherdeepknowledgeaboutknitting(針織)technology,herenthusiasmforthebrand,andherdeepunderstandingofthecashmereshopper.Iregardherasa"womanofherword."Tosummarize,IbelieveSandRiverproductsdeserveaplaceinluxuriousEuropeandepartmentstoresandMrs.Kingisareliablepartner.Ifyouhaveanyquestions,pleasedonothesitatetocontactme.Sincerely,JoanSmith 36、JoanSmithwrotetherecommendationletteronbehalfof______. A.aDutchcitizen B.herdsmanfamilies C.theEuropeanconsumer D.SandRiveranditsCEO 37、FromtheletterwecanlearnthatSandRiver______. A.haslong-termlinkswithherdsmen B.employsmanyherdsmanworkers C.manufacturesadvancedmachines D.sellshand-madeproducts 38、Thetargetconsumersofthenewly-establishedcashmerebrandare______. A.collegestudents B.blue-colorworkers C.high-incomewomen D.averageherdsmanfamilies 39、Bysaying"awomanofherword"(Para.3),thewritermeansthatMrs.King______. A.alwayskeepsherpromise B.isagoodpublicspeaker C.knowscustomerswell D.iswelleducated 40、AsfarastheEuropeanmarketisconcerned,thewriterthinksthatSandRiverproducts______. A.arefitforsupermarketsinbigcities B.arelikelytoenjoyabigmarketshare C.willappealtodifferentkindsofcustomers D.deserveaplaceinluxuriousdepartmentstores
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