單項(xiàng)選擇題You are cleaning the tanks after carrying a cargo of crude oil. Which statement is TRUE? （）.

A.Washing water should be recirculated if possible because it has the same electric potential as the cargo tank being cleaned
B.The hoses to portable cleaning machines should be disconnected before the machines are removed from the tank
C.The principal hazard with steaming cargo tanks is raising the ambient temperature above the flame point of the cargo residue
D.Steam cleaning and water washing are both capable of generating electrostatic charges within a tank


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1.單項(xiàng)選擇題While underway and towing an unmanned tank barge you are required to（）.

A.maintain a strict watch on the barge from the towing vessel
B.fly a red flag from the towing vessel
C.open the tops of all empty tanks on the barge
D.take hourly soundings of any loaded tanks on the barge

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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
C.An uninspected 35-foot passenger vessel
D.A Navy Destroyer

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題Which step is NOT generally taken when gas-freeing a tank?（）.

A.Washing the tank interior with sea water
B.Application of degreasing solvents
C.Removal of corrosion products and sludge
D.Fresh air ventilation