单项选择题

You are crossing a narrow channel in a 15-meter vessel when you sight a tanker off your port bow coming up the channel. Which statement is TRUE? （）

A.Yours is the give-way vessel because it is less than 30 meters long
B.You shall not impede the safe passage of the tanker
C.The tanker is the stand-on vessel because it is to port of your vessel
D.The tanker is the stand-on vessel because it is the larger of the two vessels

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单项选择题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

单项选择题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

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

单项选择题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

单项选择题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