单项选择题

A.posted with instructions on the operation of the syst……

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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单项选择题On a class B fire，which portable fire extinguisher would be the LEAST desirable?（）

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A.the cap should be removed to drain the boat when it is waterborne
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