单项选择题

A special daymark is a（）.

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

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A slow，gradual fall of the barometer indicates approaching（）.

A.gale force winds within 12 hours
B.blizzard conditions
C.deteriorating or unsettled weather
D.heavy，wind driven rain

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A slow rise in the barometric pressure forecasts（）.

A.rainy weather for the next 48 hours
B.high seas
C.improving weather conditions
D.deteriorating weather conditions