When welding or burning aboard a vessel, you must be certain that the space （）.<br>A:is properly vented<br>B:contains no explosive fumes<br>C:has no oil in the bilges<br>D:all of the above

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

出自：海船船员证

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