单选题On a ship，how many ring buoys are required to have a buoyant line attached?（）AOne ring life buoyBOne ring life buoy on each side of the shipCThree ring life buoysDTwo ring life buoys on each side of the ship
单选题
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
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