A.elevated pole
B.celestial body
C.zenith
D.coaltitude
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A.sleet
B.hail
C.freezing rain
D.rime
A.If one screw is stopped，the ship will turn toward the side of the stopped screw
B.The principal force which turns the ship is set up by the wake against the forward side of the rudder
C.Turning response by use of the rudder only is greater than on a single-screw vessel
D.With the rudder amidships，the ship will steer a fairly steady course
A.towed sideways by an overwhelming force on the towline
B.her tow moves parallel to and forward on either side of the tug
C.the tow is no longer directly astern but moves up on her quarter
D.All of the above
A.directly astern and pushing the tow
B.towing on a hawser
C.towing alongside and parallel to the vessel it is towing
D.towing on the hip
A.the weight of its tow，its being anchored，or grounded
B.the weight of its towing hawser on the bottom
C.an adverse current
D.lack of power or an engine breakdown
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A thin，whitish，high cloud popularly known as “mares’ tails” is（）.
A squeeze-grip type carbon dioxide portable fire extinguisher has been partially discharged. It should be（）.
A towline should be fastened to（）.
A tow that is properly aligned to pass through a narrow opening between two bridge piers is “ （）”.
A tug is best positioned for towing and maneuvering on rivers and other restricted waters where wave action is limited when（）.
A survival craft being used to pick up a person who has fallen overboard from a ship should approach the person（）.
A thrust block is designed to（）.
A spanner is a （）.
A tug in irons is（）.
A traffic separation zone is that part of a traffic separation scheme which（）.