未知题型 现有包结构：com|－－x||－－Alpha.class||||－－y||－－Beta.class||－－Gamma.class和类：／／insertcodehereimportcom.*；importcom.x.y.*；classTest{Alphaa；Betab；Gammac；}哪两行分别插入后可允许代码编译？（）

未知题型 Whichthe threearevaliddeclarationsofafloat？（）

未知题型 Youaredevelopingseveraltaglibrariesthatwillbesoldfordevelopmentofthird-partywebapplications.YouareabouttopublishthefirstthreelibrariesasJARfiles：container-tags.jar，advanced-html-form-tags.jar，andbasic-html-form-tags.jar.WhichtwotechniquesareappropriateforpackagingtheTLDfilesforthesetaglibraries？（）A.TheTLDmustbelocatedwithintheWEB-INFdirectoryoftheJARfile.B.TheTLDmustbelocatedwithintheMETA-INFdirectoryoftheJARfile.C.TheTLDmustbelocatedwithintheMETA-INF/tld/directoryoftheJARfile.D.TheTLDmustbelocatedwithinasubdirectoryofWEB-INFdirectoryoftheJARfile.E.TheTLDmustbelocatedwithinasubdirectoryofMETA-INFdirectoryoftheJARfile.