单项选择题
What is the MOST irritating to the skin?（）
A.Carbon disulfide
B.Ethyl alcohol
C.Isoprene
D.Oleum
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A.distance
B.largeness
C.diameter
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What is required to launch a boat stowed in a crescent davit?（）
A.Hoist the boat clear of the cradle
B.Release the outboard part of the cradle
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D.Crank the crescent out -
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What is normally used to pass a mooring line to a dock?（）
A.Distance line
B.Gantline
C.Heaving line
D.Tag line
