单选题0ne of the limitations of foam as an extinguishing agent is that foam（）.Acannot be made with salt waterBis heavierthan oil and sinks below its surfaceCis corrosive and to fire fightersDconducts electricity
单选题
0ne of the limitations of foam as an extinguishing agent is that foam（）.
A
cannot be made with salt water
B
is heavierthan oil and sinks below its surface
C
is corrosive and to fire fighters
D
conducts electricity
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