Wait, I'm a little confused. The question is asking about the "main" system, but the answer options include a lot of different components. I'll need to think through which one is the primary or central system used.
I've got this! The main fire fighting system in a computer room is the automatic fire alarm and gas fire extinguishing system. Smoke prevention and safe evacuation are also important, but the core system is the alarm and gas extinguishing.
Okay, let's see. The question is asking about the "main" system, so I'll need to identify the core or primary system used in computer rooms. Automatic fire alarm, gas fire extinguishing, smoke prevention - those all sound relevant.
Hmm, this seems like a straightforward question about the components of a computer room's fire fighting system. I'll need to think through the different systems that are typically involved.
Herschel
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