单项选择题
What is the（）of the turning circle in mavoeuvring?
A.distance
B.largeness
C.diameter
D.measurerment
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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
C.Rig the tricing lines
D.Crank the crescent out -
单项选择题
What is normally used to pass a mooring line to a dock?（）
A.Distance line
B.Gantline
C.Heaving line
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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.
