单项选择题

A vertex of the navigational triangle is NOT located at the（）.

A.elevated pole
B.celestial body
C.zenith
D.coaltitude

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单项选择题

A type of precipitation that occurs only in thunderstorms with strong convection currents that convey raindrops above and below the freezing level is known as（）.

A.sleet
B.hail
C.freezing rain
D.rime

单项选择题

A twin-screw vessel with a single rudder is making headway. The engines are full speed ahead. There is no wind or current. Which statement is FALSE? （）

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

单项选择题

A tug may be in danger of tripping when（）.

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

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