单选题Control valves of a CO2 system may be located within the protected space when（）.Ait is impractical to locate them outsideBthere is also a control valve outsideCthe CO2 cylinders are also in the spaceDan automatic heat-sensing trip is installed
单选题
Control valves of a CO2 system may be located within the protected space when（）.
A
it is impractical to locate them outside
B
there is also a control valve outside
C
the CO2 cylinders are also in the space
D
an automatic heat-sensing trip is installed
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