Deck_2014 : Safety - 608/5254
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| After putting on a self-contained breathing apparatus, you open the air supply and hear a continuous ringing of a bell. What does this mean? |
| A) The unit is working properly. |
| B) The face mask is not sealed properly. |
| C) The air bottle needs to be refilled. |
| D) The air supply hose has a leak. |
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