单项选择题

The number of rowing oars that must be carried in a motor-propelled open lifeboat on a cargo vessel is（）.

A.determined by the Master
B.specified by the Coast Guard
C.specified by the manufacturer
D.None

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The most likely location for a liquid cargo fire to occur on a tanker would be（）.

A.in the pumproom
B.at the vent header
C.at the main deck manifold
D.the midships house

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A vessel puts into the port of Kobe，Japan to discharge cargo. While awaiting completion of the cargo operation，the vessel contracts with a local shipyard to have the hull chipped，scaled，and painted. How is the cost of this maintenance handled with the Collector of Customs?（）

A.A declaration is required and duty is involved on the total cost
B.No declaration is required since this is considered routine maintenance
C.A declaration is made and duty is charged on the materials only
D.A declaration is made，but duty is charged on the labor only

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A vessel is equipped with cross-connected deep tanks. In which situation should the cross-connection valve be closed? （）

A.The tanks lie above the waterline and are filled
B.The tanks are partially filled with dry cargo
C.The tanks are partially filled with liquid cargo
D.The tanks are filled and lie below the waterline