单选题Which of the following components provides a direct source of seawater for the fire main system?（）ARose boxBSea chest or spool pieceCSluice valveDFire pump stuffing box
单选题
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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