单项选择题 An offshore drilling unit is required to carry on board an operations manual approved by the （）.

单项选择题 According to the regulations，the capacity of a liferaft is required to be marked（）.

单项选择题 According to the regulations for mobile offshore drilling units，“industrial personnel” are considered to be all persons carried on the ship for the sole purpose of carrying out the industrial business of the unit，except for（）.