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單項(xiàng)選擇題

A.Dry chemical (cartridge-operated)
B.Water (cartridge-operated)
C.Water (pump tank)
D.Carbon dioxide

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A.Fire ax
B.Flashlight
C.rigid helmet
D.Fresh air breathing apparatus

A.Conducts electricity
B.Difficult to store
C.Large volume necessary to be effective
D.Ineffective in powdered metal fires