Which of the following components provides a direct source of seawater for the fire main system?（）<br>A:Rose box<br>B:Sea chest or spool piece<br>C:Sluice valve<br>D:Fire pump stuffing box

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

出自：海船船员证

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