变压器不仅有变压、变流的作用,而且还有变阻抗的作用。
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TheOracleDatabase11gdatabaseisrunningintheARCHIVELOGmode.Thearchivedredologfilesarestoredonthreelocations.TheFlashRecoveryAreaisoneofthelocations.Thedetailsaregivenbelow:
LOG_ARCHIVE_DEST_1=’LOCATION=/disk1/archive’LOG_ARCHIVE_DEST_2=’SERVICE=stdb1’DB_RECOVERY_FILE_DEST=’/u01/oradata’
ExaminethefollowingRMANcommandissuedtosetthedeletionpolicyforarchivedlogfiles:
RMAN>CONFIGUREARCHIVELOGDELETIONPOLICYTOBACKEDUP2TIMESTOsbt;
Whichstatementistrueregardingwhatthiscommandaccomplishes?()
热电偶E(200℃’,100℃)等于E(300℃,200℃)。