什么色彩模式的图象转换为多通道模式时，建立的通道名称均为Alpha（）

DearSir/Madam,

IampleasedtowritealetterofrecommendationonbehalfofSandRiveranditsCEO,Mrs.JaneKing.Iamveryfamiliarwiththecompany.Mynextbookdealswithitindetail,whichistobepublishedinautumnof2018.IamalsofamiliarwithEuropeanconsumer.AsaDutchcitizen,IhavelivedinEuropefor46yearsandstudiedEuropeanconsumerbehaviorfordecades.IbelievethatSandRiverofferssomethinguniquetotheEuropeanmarket.Ithasestablishedlong-termsupplyrelationswithherdsman(牧民)familiesandownsadvancedGermanmachinery.Thusitcombinesnaturalresourceswithmodernmanufacturingtechniques.Butequallyimportant,SandRiverworkswithmodernfashiondesignerstocreatetrulycontemporaryandappealingdesigns.Theresultisanewly-establishedcashmere(羊绒)brandthatappealstoatargetgroupofhigh-incomewomen.ImetMrs.Kingthefirsttimein2013.Sincethen,wehavemetseveraltimesandtalkedaboutSandRiver'sphilosophy,strategy,andappealtobothChineseandinternationalconsumers.Iwasstruckbyherdeepknowledgeaboutknitting(针织)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

Photoshop提供了很多种图层的混合模式，下面哪些混合模式可以在绘图工具中使用而不能在图层之间使用

下面对图层上的蒙板的描述哪些是正确的：

墙模板拼接时，U型卡应正反交替安装，间距不得大于（）。