单项选择题
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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What is normally used to pass a mooring line to a dock?（）
A.Distance line
B.Gantline
C.Heaving line
D.Tag line -
单项选择题
What happens to the efficiency of an anchor when it is moved from sand to mud?（）
A.The efficiency increases
B.The efficiency decreases
C.The efficiency remains the same
D.The efficiency cannot be determined. -
单项选择题
What form of ice is of land origin?（）
A.Shuga
B.Floe
C.Spicule
D.Bergy bit
