单选题A self-contained breathing apparatus is used to（）.Amake underwater repairs to bargesBdetermine if the air in a tank is safe for menCenter areas that may contain dangerous fumes or lack oxygenDresuscitate an unconscious person
单选题
A self-contained breathing apparatus is used to（）.
A
make underwater repairs to barges
B
determine if the air in a tank is safe for men
C
enter areas that may contain dangerous fumes or lack oxygen
D
resuscitate an unconscious person
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