A.red-and-white octagon
B.daymark with a yellow stripe on it
C.green square
D.yellow diamond
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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
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
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A sufficient amount of chain must be veered when anchoring a vessel to ensure（）.
A time diagram is a diagram of the celestial sphere as observed from above the（）.
A stand-on vessel is（）.
A slow rise in the barometric pressure forecasts（）.
A strong，often violent，northerly wind occurring on the Pacific coast of Mexico，particularly during the colder months，is called（）.
A time diagram is a diagram on the plane of the（）.
A stretch where the channel changes from one side of the river to the other is called a （）.
A towing hook may be released from the（）.
A spanner is a （）.
A special daymark is a（）.