Where foam extinguishing systems are provided on a ship，each machinery flat in the protected space must have a(n)（）.<br>A:coaming<br>B:alarm<br>C:drain<br>D:fire sensor

Where foam extinguishing systems are provided on a ship，each machinery flat in the protected space must have a(n)（）.
A:coaming
B:alarm
C:drain
D:fire sensor

出自：海船船员证

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