填充图层包括下列哪些类型（）

Directions:

Inthissection,thereare10incompletesentences.Youarerequiredtocompleteeachonebydecidingonthemostappropriatewordorwordsfromthe4choicesmarkedA,B,CandD.ThenyoushouldmarkthecorrespondingletterontheAnswerSheetwithasinglelinethroughthecenter.

21、62%ofthepeoplesurveyedsaidtheyalwaysavoided______theirsmartphonesduringmeals.

A.useB.usingC.touseD.used

22、TheHRdepartmentisacriticalpartofemployeewell-beinginanybusiness,nomatter______smallitis.

A.howB.whatC.whereD.which

23、Accordingtotheregulation,inspections______toensurethatthesystemsareingoodcondition.

A.demandedB.havedemandedC.bedemandedD.aredemanded

24、Beforeyouthinkaboutaskingforapromotion,makesurethateitherapositionopeningexists______anewpositionisneededtobecreated.

A.andB.norC.orD.but

25、ThetrafficwasmakingsomuchnoisethatIcouldn'thearwhathe______.

A.issayingB.wassayingC.hassaidD.willsay

26、Ourcompanycultureis______makesussuccessfulincreatingafriendlyandexcitingenvironment.

A.whereB.howC.whatD.why

27、Mostpeopleweregreatlyshockedbythenews______theITcompanyhadgonebankrupt.

A.whatB.howC.whyD.that

28、IwouldprobablytrytofindabetterjobifI______inyourposition.

A.amB.wereC.havebeenD.be

29、Ifyouare______busytoattendthemeeting,youcansendyourassistanttotakeyourplace.

A.veryB.soC.tooD.more

30、Ihadtowaitforanothertwomonthstobeabletohavethecar______.

A.fixingB.fixC.tofixD.fixed

以下对WEB图象格式的叙述哪个是错误的：

下列哪个是photoshop图象最基本的组成单元（）

根据《水利工程安全生产管理条例》规定，施工单位在使用施工起重机械和整体提升脚手架、横板等自升式架设设施前，应当组织有关单位进行（）。