【单选题】
James Watt ()the steam engine in 1796.
A、discovered
B、had discovered
C、invented
D、had invented
A、discovered
B、had discovered
C、invented
D、had invented
A、Flashback logging is not enabled for the database. B、The changes made to the table are not committed. C、Supplemental logging is not enabled for the database. D、The database is not configured in ARCHIVELOG mode.