A.replaced in its proper location if weight loss is no more than 15%
B.replaced in its proper location if weight loss is no more than 25%
C.labeled empty and recharged as soon as possible
D.labeled empty and replaced in its proper location regardless of weight
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A.red-and-white octagon
B.daymark with a yellow stripe on it
C.green square
D.yellow diamond
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
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A slow rise in the barometric pressure forecasts（）.
A tug is “in irons” when held in a fixed position by（）
A time diagram is a diagram of the celestial sphere as observed from above the（）.
A thrust block is designed to（）.
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 stretch where the channel changes from one side of the river to the other is called a （）.
A strong，often violent，northerly wind occurring on the Pacific coast of Mexico，particularly during the colder months，is called（）.
A thin，whitish，high cloud popularly known as “mares’ tails” is（）.
A towing light is（）.
A tank 36 ft. by 36 ft. by 6 ft. is filled with water to a depth of 5 ft. If a bulkhead is placed in the center of the tank running fore-and-aft along the 36-foot axis，how will the value of the moment of inertia of the free surface be affected?（）