Engine : Engineering Safety - 879/968
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| Fire doors are released by a/an __________. |
| A) method that automatically releases the door in the event of a disruption of control system power |
| B) spring-loaded catch that automatically lifts to release the door in the event of the presence of a fire |
| C) pneumatic heat sensor |
| D) hydraulic directional valve that automatically releases the door in the event of a disruption to the control power system |
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