单项选择题
单项选择题 YouarecreatinganewformfortheOrderEntryapplication.Youdefinearecordgroupthatwillbecreatedwhentheformisexecutingthisbuiltin:CREATE_GROUP(rg_emplist,global_scope)Whichform(s)intheapplicationwillhaveaccesstothisrecordgroup?()A.Allformsintheapplication.B.Anyformsopenedbytheuserwhoinitiatedtherecordgroup.C.OnlytheformissuingtheCREATE_GROUPbuilt-in.D.Anyformsreferencedbytheformthatcontainstheprocedure.
单项选择题 Whenimportingatableintoadatabase,theimportprocessperformsthesetasks:1.Triggersareimported.2.Dataisimported.3.Newtablesarecreated.4.Indexesarebuilt.5.Anybitmap,functional,and/ordomainindexesarebuilt.6.Integrityconstraintsareenabledonthenewtables.Whichoptionshowsthetasksintheorderinwhichtheyareperformed?()A.2,3,4,1,6,5B.3,2,4,1,6,5C.3,2,6,4,1,5D.4,2,3,1,5,6
单项选择题 mpeg、mpg或dat格式是运动图像专家组(MPEG)格式,釆用这种格式的家用设备不包括____。
单项选择题 目前许多外部设备(如数码相机、打印机、扫描仪等)采用了USB接口,下面关于USB的叙述中,错误的是( )。
单项选择题 (超)五类线终接后,应有余量。交接间、设备间对绞电缆长度宜为()m,有特殊要求的应按设计要求预留长度。