单选题CO2 cylinders，which protect the small space in which they are stored must（）.ANOT contain more than 200 pounds of CO2Bbe automatically operated by a heat actuatorChave an audible alarmDAll of the above
单选题
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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