单选题CO2 cylinders equipped with pressure actuated discharge heads will discharge automatically when（）.Athe discharge valve is openBthe control box glass is brokenCpressure from the control cylinders is detectedDthe control cylinders have been completely discharged
单选题
CO2 cylinders equipped with pressure actuated discharge heads will discharge automatically when（）.
A
the discharge valve is open
B
the control box glass is broken
C
pressure from the control cylinders is detected
D
the control cylinders have been completely discharged
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