单项选择题
A racetrack turn would be better than a Williamson turn in recovering a man overboard if （）.
A.the man has been missing for a period of time
B.the sea water is very cold and the man is visible
C.there is thick fog
D.the wind was from astern on the original course
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While moving ahead，a twin-screw ship has an advantage over a single-screw ship because （）.
A.correct trim will be obtained more easily
B.drag effect will be cancelled out
C.side forces will be eliminated
D.speed will be increased -
单项选择题
When towing astern，one way to reduce yawing of the tow is to（）.
A.trim the tow by the stern
B.trim the tow by the head
C.have the tow on an even keel
D.list the tow on the side it is yawing -
单项选择题
When a vessel navigates in an area with a small underkeel clearance but with adequate space to take avoiding action she（）.
A.should not be regarded as a vessel constrained by her draught
B.should be regarded as a vessel constrained by her draught
C.shall be regarded as a vessel restricted in her ability to maneuver
D.should be regarded as a non-displacement vessel
