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单选题
While you are working in a space，the fixed CO2 system is accidentally activated．You should（）.
A
Secure the applicators to preserve the charge in the cylinders
B
Continue with your work as there is nothing you can do to stop the flow of CO2
C
Retreat to fresh air and ventilate the compartment before returning
D
Make sure all doors and vents are secured
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Open the guardian valve and standby to maneuverD
Open the master control valves on the fixed CO2 system
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