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（）.
- Adamage from crane operations
- Bbeing used for wash down purposes
- Caccidental diversion of flow to wrong location
- Dfreezing
问题
A cutoff valve in the fire-main system
参考解析：
分类：燃烧与爆炸题库
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