Themaincausesoffireonboardshipsare（）
A. oilleakageinengine-room
B. hotwork(welding,cutting,etc)
C. staticelectricity
D. alloftheabove
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WhichstepisNOTgenerallytakenwhengas-freeingatank?（）.
A. Washingthetankinteriorwithseawater
B. Applicationofdegreasingsolvents
C. Removalofcorrosionproductsandsludge
D. Freshairventilation
WhichsubstanceisNOTconsideredtobeOilunderthepollutionpreventionregulations?（）
A. Petroleumandfueloil
B. Sludge
C. Oilmixedwithdredgespoil
D. Oilrefuseandoilmixedwithwastes
Theresultsoftheauditsandreviews（）totheattentionofallpersonnelhavingresponsibilityintheareainvolved.
A. shouldbring
B. shouldbebrought
C. shouldtake
D. shouldbetaken
Whiletestingacargotank，youroxygenindicatorreads25%oxygeninthetank.Youwouldthen（）.
A. enterthetanksafely
B. suspecttheaccuracyofthereading
C. ventilatethetank
D. testfornitrogen
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