问题：
[单选题]A ship must have a self-contained breathing apparatus to be used as protection from gas leaking from a refrigeration unit. To meet this requirement，you may use（）.
A、a gas mask certified by the Mine Safety and Health Administration
B、the same self-contained breathing apparatus required with the fireman's outfit
C、an oxygen breathing apparatus，provided that the device has been inspected within three years
D、a portable ventilation system that will provide a complete change of air every three minute
参考答案：
B
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