One of the limitations of foam as an extinguishing agent is that foam（）.<br>A:cannot be made with salt water<br>B:is heavier than oil and sinks below its surface<br>C:is corrosive and a hazard to fire fighters<br>D:conducts electricity

One of the limitations of foam as an extinguishing agent is that foam（）.
A:cannot be made with salt water
B:is heavier than oil and sinks below its surface
C:is corrosive and a hazard to fire fighters
D:conducts electricity

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