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 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 slow，gradual fall of the barometer indicates approaching（）.
A traffic separation zone is that part of a traffic separation scheme which（）.
A thrust block is designed to（）.
A vertex of the navigational triangle is NOT located at the（）.
A strong，often violent，northerly wind occurring on the Pacific coast of Mexico，particularly during the colder months，is called（）.
A towing light is（）.
A spanner is a （）.
A stretch where the channel changes from one side of the river to the other is called a （）.
A sufficient amount of chain must be veered when anchoring a vessel to ensure（）.