单选题When welding or burning aboard a vessel, you must be certain that the space （）.Ais properly ventedBcontains no explosive fumesChas no oil in the bilgesDall of the above
单选题
When welding or burning aboard a vessel, you must be certain that the space （）.
A
is properly vented
B
contains no explosive fumes
C
has no oil in the bilges
D
all of the above
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