A、When it is a DC machine
B、When it is an AC machine
C、Any machine that operates on over 100 volts
D、Only when working on wet steel plates
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A、 when you need to disable the index usage B、 when you need to change storage options C、 when you need to enable index monitoring D、 when you need to move the index to another tablespace
A、When vessel is on fire B、When vessel is not under command C、When vessel is carrying the dangerous cargoes D、When vessel is restricted in her ability to maneuver
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