单项选择题

Which letter means that oil-spilling has happened?（）

A.P
B.O
C.S
D.G

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单项选择题
（）is best for electrical fire.

A. Dry extinguisher
B. Power extinguisher
C.A+B
D. CO2 extinguisher
单项选择题
Which of the following is not the emergency equipment?（）

A. Emergency power supply.
B. Quick-close device.
C. Emergency squad.
D. derricks.
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