单项选择题
A.Clove hitch B.Figure-eight knot C.Fisherman's bend D.Overhand knot
On a ship，when may a work vest be substituted for a req...
单项选择题On a ship，when may a work vest be substituted for a required life preserver?（）
A.To replace a damaged life preserver B.For use during fire drills C.For use during boat drills D.At no time
On a ship，watertight doors should be operated（）.A.durin...
单项选择题On a ship，watertight doors should be operated（）.
A.during abandon drill B.during fire drill C.weekly D.when the rig is being moved
On a ship，how many ring buoys are required to have a bu...
单项选择题On a ship，how many ring buoys are required to have a buoyant line attached?（）
A.One ring life buoy B.One ring life buoy on each side of the ship C.Three ring life buoys D.Two ring life buoys on each side of the ship
