Engine : Engineering Safety - 609/968
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| What is a major advantage of using a positive pressure type self-contained breathing apparatus? |
| A) Facial hair will not affect the mask performance. |
| B) The equipment is lightweight and the wearer can work without difficulty in confined spaces. |
| C) The average operating time is over an hour. |
| D) The speed with which it can be put into operation is around 45 seconds. |
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