单选题The main causes of fire on board ships are （）Aoil leakage in engine-roomBhot work (welding, cutting, etc)Cstatic electricityDall of the above
单选题
The main causes of fire on board ships are （）
A
oil leakage in engine-room
B
hot work (welding, cutting, etc)
C
static electricity
D
all of the above
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