单项选择题
A."A" fire B."B" fire C."C" fire D."D" fire
Which of the following components provides a direct sou...
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
Fires involving combustible metals are classified as （）...
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
Which of the following gases represents the greatest th...
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
