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One disadvantage of using regular dry chemical (sodium bicarbonate) in firefighting is that（）.
A:it can break down under high heat and emit noxious fumes
B:it will decompose under prolonged storage and lose its effectiveness
C:fire has been known to flash back over the surface of an oil fire
D:it is ineffective in fighting fires in high-voltage electrical equipment

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出自：海船船员证

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