31.__________ means the height of the ship's side above the waterline. (A)Air draft (B)Under keel clearance (C)Freeboard (D)Draft

8.翻譯：危險急迫嗎？是的，有穩定度減小的危險。 (A)Is danger imminent? Yes, danger of damage by sea. (B)Is danger imminent? Yes, danger of decreasing stability. (C)Is danger imminent? Yes, danger of breaking apart. (D)Is danger imminent? Yes, danger of environmental pollution.