单项选择题

While testing a cargo tank，your oxygen indicator reads 25% oxygen in the tank. You would then （）.

A.enter the tank safely
B.suspect the accuracy of the reading
C.ventilate the tank
D.test for nitrogen

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Which vessel in ocean service is not subject to Annex V of MARPOL 73 78? （）

A.A 20-foot sailing vessel
B.A 26-foot tug and tow
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Which substance is NOT considered to be Oil under the pollution prevention regulations? （）

A.Petroleum and fuel oil
B.Sludge
C.Oil mixed with dredge spoil
D.Oil refuse and oil mixed with wastes
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