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1、用户在安装win7的时候,会在系统里面安装虚拟光驱。可是在安装过程中有时会把之前的虚拟光驱删除掉,同时发现原来的物理光驱也不能用了。为什么会出现这样的问题呢?下面就和笔者一起看看怎么解决这个问题吧。虚拟光驱指的是一种模拟(CD/DVD-ROM)工作的工具软件,可以生成和你电脑上所安装的光驱功能一模一样的光盘镜像,一般光驱能做的事虚拟光驱一样可以做到。temperaturepipingandequipment,avoidoilpipeline,avoidingvibrationequipment,principlesofconstr
2、uctionofbeautifulandneateasytoinstall.5.1.5.2fromfieldinstrumentationandvalvesfieldjunctionboxestothesinglelineslotcableusingpipe,220VACpowercordshallbefullpipelaying,indoorcoaxialcablesconcealedandoutdoorwearburied.5.1.5.3bendingcoldbendingmethodshouldbeusedtoprotect
3、pipe,bendingangleshouldnotbelessthan900,whenwearingnon-armouredcableandlaid,bendradiusshouldnotbelessthan6timesthepipediameter,whenwhilewearingarmoredcableandconcealed,bendradiusshouldnotbelessthan10timesthepipediameter.Bendprotectiontubethereshouldbenodents,cracks,si
4、ngleright-angledbendprotectiontubeshouldnotbemorethantwo.5.1.5.4betweenprotectivetubeandbetweenprotectivetubeandconnector,threadedconnectionsshouldbeused,ittubeendscrewthreadlengthshouldnotbelessthan1/2ofthefitting,andensurestheelectricalconnection.5.1.5.5protectiontu
5、beshouldlineup,...5.1.75.1.7.1checktubingforpressurepipinglayingpipe,components,materialsandspecificationsmeetthedesignrequirements,andhavequalitycertificates,beforelayingshouldbeclearedbyweldingandbendingtheweldingslag,rust,chiporaforeignbody,andpreservativetreatment
6、s.5.1.7.2inpressurepipingweldingweldermusthaveavalidweldercertificate.5.1.7.3tubingundertheconditionstomeetmeasurementrequirementsshouldbeasshortaspossible,Generallengthshouldnotbemorethan15m,pipebendingcoldbending,cuttingmachine,minimizingbendingandcross,andthereshal
7、lbenosharpandcomplexbending,bendingradiusofnotlessthan3timesthepipediameter.5.1.7.4pipeandprocessequipment,piping,orbuildingsurfacedistanceisgreaterthan50mm,notbelaidparalleltotheoil,combustible,explosive物理光驱:一般的光驱就是物理光驱,光盘在光驱里面高速转动,磁头通过激光读取光盘表面记录的数据,利用了物理原理。1、打开运行对话框
8、并运行Regedit,回车打开表编辑器;2、再依次展开定位到HKEYLOCALMACHINEEnumSCSI分支;3、之后在窗口右侧中可以找到系统中所安装的光驱信息,找到字符串键值项UserDrive-LetterAssignment,这个键值指的