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A cabinet or space containing the controls or valves for the fixed firefighting system must be（）.

A.posted with instruction on the operation of the systm
B.ventilated and equipped with explosion-proof switches
C.painted with red and black diagonal stripes
D.equipped with a battery powered source of emergency lighting

單項選擇題

A carbon dioxide fire extinguisher should be recharged（）.

A.at least annually
B.whenever it is below its required weight
C.only if the extinguisher has been used
D.before every safety inspection