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單項(xiàng)選擇題

A fire involving aluminum powder would be a class （）.

A."A" fire
B."B" fire
C."C" fire
D."D" fire

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

Fires involving combustible metals are classified as （）.

A.class "A" fires
B.class "B" fires
C.class "C" fires
D.class "D" fires

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