Before a Flashback Table operation, you execute the following command: ALTER TABLE employees ENABLE ROW MOVEMENT; Why would you need this to be executed?（）
1、Before a magnetic compass is adjusted
Before a magnetic compass is adjusted certain correctors must be checked to ensure that they are free of permanent magnetism. These correctors ...
A between B beforeAC since D later
3、Before（）,a station shall take precauti
Before（）,a station shall take precautions to ensure that its emission will not interfere with transmission already in progress.AtransmitBto transmittingCtransmittingDin transmitting
4、Before operating a non-oceangoing ship
Before operating a non-oceangoing ship greater than 100 gross tons it must have a fixed piping system to discharge oily mixtures ashore. This ...
Before a Flashback Table operation，you execute the following command：  ALTER TABLE employees ENABL...
6、A seaman leaves a vessel before it sai
A seaman leaves a vessel before it sails from a foreign port. He informs the Chief Officer that he won’t return. After the vessel sails，the...