單項(xiàng)選擇題The permanent magnetism of a vessel may change in strength due to（）.

A.the nature of the cargo being carried
B.changes in heading
C.major structural repair
D.All of the above


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題A sling psychrometer is a(n)（）.

A.type of cargo gear
B.instrument used in celestial navigation
C.instrument used to measure relative humidity
D.instrument used to measure specific gravity