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（）.

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

单项选择题 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?（）