单项选择题
A.at the bow B.at the stern C.in the middle D.all around
A life float on a fishing vessel must be equipped with ...
单项选择题A life float on a fishing vessel must be equipped with （）.
A.a painter B.red smoke flares C.a jackknife D.a signal mirror
A life preserver or buoyant work vest is required to be...
单项选择题A life preserver or buoyant work vest is required to be worn on a ship when a person is （）.
A.working on the rig floor B.working over water C.working on the pipe racks D.operating line throwing equipment
A latitude line will be obtained by observing a body （）...
单项选择题A latitude line will be obtained by observing a body （）.
A.on the prime vertical B.on the celestial horizon C.at lower transit D.on the Greenwich meridian
