单项选择题
A spanner is a （）.
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
A sling psychrometer is used to measure（）.
A.seawater temperature
B.engine temperature
C.dry bulb and wet bulb temperatures
D.barometric pressure
