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

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

出自：海船船员证

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