单项选择题
Which of the following components provides a direct source of seawater for the fire main system?（）
A.Rose box
B.Sea chest or spool piece
C.Sluice valve
D.Fire pump stuffing box
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相关考题
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单项选择题
Fires involving combustible metals are classified as （）.
A.class "A" fires
B.class "B" fires
C.class "C" fires
D.class "D" fires -
单项选择题
Which of the following gases represents the greatest threat to personnel safety in an engine room where the exhaust is leaking from a diesel engine?（）
A.Carbon dioxide
B.Carbon monoxide
C.Carbon trioxide
D.Hydrogen sulfide -
单项选择题
Seawater may be used for drinking water （）.
A.at a maximum rate of two ounces per day
B.after mixing with an equal quantity of fresh water
C.if gather during or immediately after a hard rain
D.under no circumstance
