单项选择题

Each part of the fire-main system located on an exposed deck must be（）.

A.protected against freezing
B.locked to prevent theft
C.numbered sequentially
D.pressurized at all times

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Each hose in the fuel transfer system for helicopter refueling must meet the standards of the（）.

A.Federal Aviation Administration
B.Corps of Engineers
C.National Fire Protection Association
D.National Transportation Safety Board

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Each hand portable fire extinguisher must be marked with（）.

A.the name of the vessel on which it is located
B.the date that it was installed
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Each fireman’s outfit and its spare equipment on a vessel must be stowed（）.

A.in a locked cabinet in the machinery space
B.in an unlocked cabinet in the machinery space
C.in a separate and accessible location
D.at a fire hydrant location