单选题A portable foam (stored-pressure type) fire extinguisher would be most useful in combating a fire in（）.AgeneratorsBoil drumsCthe bridge controlsDcombustible metals
单选题
A portable foam (stored-pressure type) fire extinguisher would be most useful in combating a fire in（）.
A
generators
B
oil drums
C
the bridge controls
D
combustible metals
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