单选题For use as protection from gas leaking from a refrigeration unit，each ship must be equipped with a（）.Aportable ventilation systemBflame safety lampCself-contained breathing apparatusDgas mask
单选题
For use as protection from gas leaking from a refrigeration unit，each ship must be equipped with a（）.
A
portable ventilation system
B
flame safety lamp
C
self-contained breathing apparatus
D
gas mask
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