单项选择题

A.oxygen and explosion meter when it is used for detect……

The required fireman’s outfits required for ship’s are not to be used for any other purpose EXCEPT for the（）.

A.oxygen and explosion meter when it is used for detection of flare gases
B.self-contained breathing apparatus，when used as protection from gas leaking from a refrigeration unit
C.boots and gloves that are made of rubber or electrically non-conductive material，if used when repairing electrical equipment
D.lifeline，if used by personnel entering a compartment which might be deficient of oxygen

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