CO2 cylinders，which protect the small space in which they are stored must（）. A:NOT contain more than 200 pounds of CO2 B:be automatically operated by a heat actuator C:have an audible alarm D:All of the above

CO₂ cylinders，which protect the small space in which they are stored must（）.
A:NOT contain more than 200 pounds of CO₂
B:be automatically operated by a heat actuator
C:have an audible alarm
D:All of the above

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