A cutoff valve in the fire-main system of a ship may be closed to protect the portion of the system on an exposed deck from（）.<br>A:damage from crane operations<br>B:being used for wash down purposes<br>C:accidental diversion of flow to wrong location<br>D:freezing

A cutoff valve in the fire-main system of a ship may be closed to protect the portion of the system on an exposed deck from（）.
A:damage from crane operations
B:being used for wash down purposes
C:accidental diversion of flow to wrong location
D:freezing

出自：海船船员证

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