单项选择题

如果有两个事务,同时对数据库中同一数据进行操作,不会引起冲突的操作是______。

A.其中有一个是DELETE
B.-个是SELECT,另一个是UPDATE
C.两个都是SELECT
D.两个都是UPDATE
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单项选择题
Sub-contractorsshouldobeythecontractorininformationsystemproject.Whencensoringsub-contractors,thesupervisormostlyconcernsabout______.
A.Amountofsubcontract
B.qualificationsandabilitiesofsub-contractors
C.responsibilitiesandobligationsofsub-contractors
D.thecontentsofthesubcontract
单项选择题
Aworkbreakdownstructure(WBS)isatoolusedtodefineandgroupaproject’sdiscreteworkelementsinawaythathelpsorganizeanddefinethetotalworkscopeoftheproject.AWBSismostusefulfor______.
A.identifyingindividualtasksforaproject
B.schedulingthestartoftasks
C.schedulingtheendoftasks
D.determiningpotentialdelays
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