20. If the slings do not permit safe cargo handling, we shall _____ . (A) repair those slings (B) replace those slings (C) usethose slings with cautions (D) double up those slings and use them for cost saving

23. 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.