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單項(xiàng)選擇題

What is the MOST irritating to the skin?（）

A.Carbon disulfide
B.Ethyl alcohol
C.Isoprene
D.Oleum

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單項(xiàng)選擇題

What is the（）of the turning circle in mavoeuvring?

A.distance
B.largeness
C.diameter
D.measurerment

單項(xiàng)選擇題

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
C.Rig the tricing lines
D.Crank the crescent out

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