A.cross connection line between two main fire lines
B.special wrench for the couplings in a fire hose line
C.tackle rigged to support a fire hose
D.None of the above
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A.gale force winds within 12 hours
B.blizzard conditions
C.deteriorating or unsettled weather
D.heavy，wind driven rain
A.rainy weather for the next 48 hours
B.high seas
C.improving weather conditions
D.deteriorating weather conditions
A.seawater temperature
B.engine temperature
C.dry bulb and wet bulb temperatures
D.barometric pressure
A.Shift weight to the bow
B.Shift weight to the center of the boat
C.Shift weight to the stern
D.Throw excess weight overboard
A.entirely damaged
B.prejudice
C.total loss
D.injury
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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 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 squeeze-grip type carbon dioxide portable fire extinguisher has been partially discharged. It should be（）.
A traffic separation zone is that part of a traffic separation scheme which（）.
A tow that is properly aligned to pass through a narrow opening between two bridge piers is “ （）”.
A thin，whitish，high cloud popularly known as “mares’ tails” is（）.
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 survival craft being used to pick up a person who has fallen overboard from a ship should approach the person（）.
A towing light is（）.
A tsunami is caused by a(n)（）.