单选题Actuating the CO2 fixed system causes the shutdown of the（）.Afuel supplyBexhaust ventilationCsupply and exhaust ventilationDmechanical and natural ventilation
单选题
Actuating the CO2 fixed system causes the shutdown of the（）.
A
fuel supply
B
exhaust ventilation
C
supply and exhaust ventilation
D
mechanical and natural ventilation
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