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Whichwilldeclare themethodthatforcesasubclasstoimplementit？（）

A.publicdoublemethoda（）：
B.staticvoidmethoda（doubled1）{}
C.publicnativedoublemethoda（）：
D.abstractpublicfoidmethoda（）：
E.protectedvoidmethoda（doubled1）{}
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TheTRANS_SUMMARYtablecontainsproduct-wisetransactiondetailsthatgetupdatedwitheverytransactioninthesystem.Eachrowhascumulativetransactiondetailsofasingleproductandeveryproductisidentifiedbyaproductcode，whichistheprimarykey.Aspartofthearchivalprocess，thecompanywantstotransfertherowsintheTRANS_SUMMARYtabletotheTRANS_SUMMARY_DUPtableattheendofeveryquarteroftheyear.Alongwithexistingproducts，thecompanydealswithmanynewproductsduringeveryquarter.
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YouareinstallingOracleDatabase11gonamachine.Whenyouruntheinstaller，theOracleUniversalInstaller（OUI）showsthemessagethatsaysoneoftheproduct-specificprerequisitecheckshasfailed：Checkingavailableswapspacerequirements...Expectedresult：1512MBActualResult：1018MBCheckcomplete.Theoverallresultofthischeckis：Failed<<<<Problem：Thesystemdoesnothavetherequiredswapspace.Whathappenstotheinstallationinthissituation（）
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