单选题A fire hose with a nozzle attached must be connected to each hydrant except when exposed to heavy weather or when the（）.Afire hose might be damaged by cargo operationsBvessel is in portCfire-main system is not chargedDfire pumps are used for purposes other than supplying water to the fire main
单选题
A fire hose with a nozzle attached must be connected to each hydrant except when exposed to heavy weather or when the（）.
A
fire hose might be damaged by cargo operations
B
vessel is in port
C
fire-main system is not charged
D
fire pumps are used for purposes other than supplying water to the fire main
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