The main causes of fire on board ships are （）<br>A:oil leakage in engine-room<br>B:hot work (welding, cutting, etc)<br>C:static electricity<br>D:all of the above

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

出自：海船船员证

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