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单选题
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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考题
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vapor condensation on the extinguisherD
the discharge causing a static spark
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