单项选择题 If your asphalt barge has operated more than 12 months in saltwater in the 24 month period since it was last dry-docked，when is it required to be hauled out again? （）

单项选择题 If the meter needle of the oxygen indicator cannot be set to zero，what should be done? （）

单项选择题 If dangerous goods have been thrown overboard by the Shipowner or the master，（）can be made liable for their loss.