单项选择题
A.A
B.B
C.C
D.D
单项选择题 ServletAreceivesarequestthatitforwardstoservletBwithinanotherwebapplicationinthesamewebcontainer.ServletAneedstosharedatawithservletBandthatdatamustnotbevisibletootherservletsinA’swebapplication.InwhichobjectcanthedatathatAshareswithBbestored？（）
多项选择题 Forwhichthreeeventscanwebapplicationeventlistenersberegistered？（）
多项选择题 AdeveloperchoosestoavoidusingSingleThreadModelbutwantstoensurethatdataisupdatedinathread-safemanner.Whichtwocansupportthisdesigngoal？（）
