单项选择题
On a ship，a cabinet or space containing the controls or valves for the fixed firefighting system must be（）.
A.posted with instructions on the operation of the system
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
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A.Carbon dioxide
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Oily rags stored in a pile that is open to the atmosphere are a hazard because they may（）.
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