单项选择题
Due to the shape of the sea anchor，the best way to haul it back aboard is by（）.
A.hauling in on the anchor line as you would any anchor B.getting all hands to assist C.its trip line D.cutting the line，as you cannot haul it back in
单项选择题 Deficient oxygen content inside a chain locker can be detected with（）.
单项选择题 Continuous sounding of a fog whistle by a vessel is a signal（）.
单项选择题 Before entering the chain locker，you should（）.
