什么是数据库的安全性?
什么叫做三相五线制?三相五线制标准导线颜色是什么?
某桥基础为6根2.0m的桩基，桩长35m，桩顶设置承台。地质条件如下：原地面往下依次为2m的覆盖层和含15%砂砾石的土，施工水位比桩顶高1.5m，施工单位拟选用正循环回转转机，钢护筒结构，采用导管法灌注水下混凝寸。
问题：
1、在成孔过程中应注意哪些方面?
2、在清孔过程中应注意哪些方面?
3、如何进行水下混凝土的浇筑?
编制竣工图的基本要求有哪些?
swtich是否能作用在byte上，是否能作用在long上，是否能作用在String上?
电灯、电热、单台电动机及多台电动机等各类负荷的熔体应怎样选择?
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
请写出施工资料包括的八个主要内容。
什么是触发器?触发器有哪几种?触发器有什么优点?
低压电力电缆敷设前应做哪些检查和试验?