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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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