Engine_2014 : Engineering Safety - 1898/2355
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| When the alarm bell on a self-contained breathing apparatus sounds, how much air supply remains? |
| A) A 4-5 minute supply of air. |
| B) A 2-3 minute supply of air. |
| C) A 1 minute supply of air. |
| D) Less than 1 minute supply of air. |
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