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单选题
Officers use sextants to observe （）.
A
stars
B
celestial bodies
C
the sun
D
the moon
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RMAN would use the control file of the target database to maintain the backup.C
RMAN would use the recovery catalog of the target database to maintain the backup.D
RMAN would use the control file of the target database to maintain the backup metadata. E
RMAN would use the recovery catalog of the target database to maintain the backup metadata.
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Ship security officerB
Company security officerC
Port facility security officerD
PSC officer
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