publicclassArrayTest{publicstaticvoidmain（String[]args）{floatfl[]，f2[]；fl=newfloat[10]；f2=f1；System.out.println（f2[0]=＋f2[0]）；}}Whatistheresult？（）

单项选择题Youexecutedthefollowingquery：SELECToperation，undo_sql，table_nameFROMflashback_transaction_queryWhichstatementiscorrectregardingthequeryoutput？（）

单项选择题Givenbelowisalistofscenarios：1）Auserterminateshissessionabnormally.2）Theconnectionbetweentheserverandtheclientapplicationterminatesbecauseofanetworkfailure.3）Aschemaisaccidentallydropped.4）Thetablespaceisaccidentallydroppedfromthedatabase.5）Theharddiskgetscorruptedandthedatafilesinthediskarelost.6）Thedatabaseinstanceabnormallyshutsdownbecauseofpowerfailure.WhichscenariosrequireDBAinterventiontoperformrecovery（）A.1，3，and6B.4，5，and6C.3，4，and5D.1，2，and6

单项选择题如果要使装入内存的程序在内存中移动后仍能正常运行，必须要有( )的支持。

单项选择题Youarecreatingacontentmanagementsystem（CMS）&ensp

单项选择题publicclassClassA{11.publicvoidcount（inti）{12.count（＋＋i）；13.}14.}And：20.ClassAa=newClassA（）；21.a.count（3）；Whichexceptionorerrorshouldbethrownbythevirtualmachine？（）