单项选择题
A lifeline must be connected to the liferaft （）.
A.at the bow B.at the stern C.in the middle D.all around
单项选择题 A life float on a fishing vessel must be equipped with （）.
单项选择题 A life preserver or buoyant work vest is required to be worn on a ship when a person is （）.
单项选择题 A latitude line will be obtained by observing a body （）.
