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 tsunami is caused by a(n)（）.
A spanner is a （）.
A thin，whitish，high cloud popularly known as “mares’ tails” is（）.
A vertex of the navigational triangle is NOT located at the（）.
A tug in irons is（）.
A tow of 9 barges is made up three abreast by three long. The towboat is faced up to the last barge of the center string. The outer two strings of barges are the（）.
A squeeze-grip type carbon dioxide portable fire extinguisher has been partially discharged. It should be（）.
A tug is “in irons” when held in a fixed position by（）
A tank 36 ft. by 36 ft. by 6 ft. is filled with water to a depth of 5 ft. If a bulkhead is placed in the center of the tank running fore-and-aft along the 36-foot axis，how will the value of the moment of inertia of the free surface be affected?（）
A stretch where the channel changes from one side of the river to the other is called a （）.