A.shown below the stern light
B.white in color
C.displayed at the masthead
D.a yellow light having the same characteristics as the stern light
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A.shown at the bow
B.white in color
C.shown in addition to the stern light
D.an all-round light
A.tug's engineroom or the bow
B.pilot house or aft steering station
C.forecastle
D.towing bitts by reaching over and releasing a lever
A.on course
B.headed fair
C.holding on
D.in shape
A.port and starboard strings
B.outer strings
C.drag strings
D.side strings
A.a mechanical breakdown on the tug
B.adverse tidal current conditions
C.the tug reducing its speed
D.All of the above
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A strong，often violent，northerly wind occurring on the Pacific coast of Mexico，particularly during the colder months，is called（）.
A slow rise in the barometric pressure forecasts（）.
A tug in irons is（）.
A thin，whitish，high cloud popularly known as “mares’ tails” is（）.
A tug may be in danger of tripping when（）.
A vertex of the navigational triangle is NOT located at the（）.
A swift current occurring in a narrow passage connecting two large bodies of water，which is produced by the continuously changing difference in height of tide at the two ends of the passage，is called a（）.
A tow that is properly aligned to pass through a narrow opening between two bridge piers is “ （）”.
A sufficient amount of chain must be veered when anchoring a vessel to ensure（）.
A stretch where the channel changes from one side of the river to the other is called a （）.