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單項(xiàng)選擇題

After each reading of an oxygen indicator，the instrument should be purged with（）.

A.CO₂
B.fresh air
C.the tested compartment's air
D.water

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單項(xiàng)選擇題

Actuating the CO₂ fixed system causes the shutdown of the（）.

A.fuel supply
B.exhaust ventilation
C.supply and exhaust ventilation
D.mechanical and natural ventilation

單項(xiàng)選擇題

A safety outlet is provided on the CO₂ discharge piping to prevent（）.

A.over pressurization of the space being flooded
B.rupture of cylinder due to temperature increase
C.over pressurization of the CO₂ discharge piping
D.flooding of a space where personnel are present

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