How long warning must be provided by the CO2 warning Mann before CO2 is discharged into a space （）. A:5 seconds B:10 seconds C:15 seconds D:20 seconds

How long warning must be provided by the CO₂ warning Mann before CO₂ is discharged into a space （）.
A:5 seconds
B:10 seconds
C:15 seconds
D:20 seconds

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