单项选择题 “Insufficiency of manning or insufficiency of certification of seafarers ” is an identification of a （）

单项选择题 A vessel has been equipped with an oil lubricated stern bearing and is undergoing a routine dry-dock.Which of the following inspection should be made when the tail-shaft has been drawn?（）

单项选择题 Inspection of a vessel’s propeller during dry-dock should include （）